diff --git a/.gitignore b/.gitignore
index ce19f7d..2dca653 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,7 @@
 # ---> C++
 # Prerequisites
 *.d
-
+*.txt
 # Compiled Object files
 *.slo
 *.lo
diff --git a/Aufgabe 4/CMakeLists.txt b/Aufgabe 4/CMakeLists.txt
new file mode 100644
index 0000000..6dfaeb9
--- /dev/null
+++ b/Aufgabe 4/CMakeLists.txt	
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.31)
+project(Aufgabe_4)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(Aufgabe_4 main.cpp)
diff --git a/Aufgabe 4/main.cpp b/Aufgabe 4/main.cpp
new file mode 100644
index 0000000..205570c
--- /dev/null
+++ b/Aufgabe 4/main.cpp	
@@ -0,0 +1,220 @@
+#include <iostream>
+#include <vector>
+#include <fstream>
+
+
+enum directions {
+    UP = 0,
+    UP_RIGHT = 1,
+    RIGHT = 2,
+    DOWN_RIGHT = 3,
+    DOWN = 4,
+    DOWN_LEFT = 5,
+    LEFT = 6,
+    UP_LEFT = 7,
+    END = 8
+};
+
+enum double_m {
+    TOP = 1,
+    FRONT = 2,
+    BOTTOM = 3,
+    BACK = 4,
+    END_M = 5
+};
+
+bool IsWord(std::vector<std::vector<std::string>>& array_2d, int vert_index, int horz_index, int vert_val, int horz_val) {
+    if (array_2d[vert_index + vert_val][horz_index + horz_val] != "M") return false;
+    if (array_2d[vert_index + (vert_val * 2)][horz_index + (horz_val * 2)] != "A") return false;
+    if (array_2d[vert_index + (vert_val * 3)][horz_index + (horz_val * 3)] != "S") return false;
+    return true;
+}
+
+bool IsValidIndex(int vert_index, int horz_index, int vert_val, int horz_val, int horz_size, int vert_size) { // vert and horz val : UP=1 DOWN=-1 | LEFT=-1 RIGHT=1 | No Change = 0
+    if (vert_index + (vert_val*3) < 0 || vert_index + (vert_val*3) >= vert_size) return false;
+    if (horz_index + (horz_val*3) < 0 || horz_index + (horz_val*3) >= horz_size) return false;
+    return true;
+}
+
+
+int CheckForXMAS(std::vector<std::vector<std::string>>& array_2d, int vert_index, int horz_index) {
+    int num_of_XMAS_words = 0;
+    for (int i = UP; i < END; ++i) {
+        switch (static_cast<directions>(i)) {
+            case UP : { // VERT=1 HORZ=0
+                if (IsValidIndex(vert_index, horz_index, 1, 0, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, 1, 0)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case UP_RIGHT : { // VERT=1 HORZ=1
+                if (IsValidIndex(vert_index, horz_index, 1, 1, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, 1, 1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case RIGHT : { // VERT=0 HORZ=1
+                if (IsValidIndex(vert_index, horz_index, 0, 1, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, 0, 1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case DOWN_RIGHT : { // VERT=-1 HORZ=1
+                if (IsValidIndex(vert_index, horz_index, -1, 1, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, -1, 1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case DOWN : { // VERT=-1 HORZ=0
+                if (IsValidIndex(vert_index, horz_index, -1, 0, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, -1, 0)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case DOWN_LEFT : { // VERT=-1 HORZ=-1
+                if (IsValidIndex(vert_index, horz_index, -1, -1, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, -1, -1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case LEFT : { // VERT=0 HORZ=-1
+                if (IsValidIndex(vert_index, horz_index, 0, -1, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, 0, -1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case UP_LEFT : { // VERT=1 HORZ=-1
+                if (IsValidIndex(vert_index, horz_index, 1, -1, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord(array_2d, vert_index, horz_index, 1, -1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            default : std::cerr << "\nHow did I end up here?" << i << ""; break;
+        }
+    }
+    return num_of_XMAS_words;
+}
+
+bool IsValidIndex2(int vert_index, int horz_index, int horz_size, int vert_size) { // vert and horz val : UP=1 DOWN=-1 | LEFT=-1 RIGHT=1 | No Change = 0
+    if (vert_index - 1 < 0 || vert_index + 1 >= vert_size) return false;
+    if (horz_index - 1 < 0 || horz_index + 1 >= horz_size) return false;
+    return true;
+}
+
+
+bool IsWord2(std::vector<std::vector<std::string>>& array_2d, int vert_index, int horz_index, int vert_val, int horz_val) {
+    bool check_left_right = false;
+    bool check_up_down = false;
+    if (vert_val == 1 || vert_val == -1) check_left_right = true;
+    if (horz_val == 1 || horz_val == -1) check_up_down = true;
+
+    if (check_left_right) {
+        if (array_2d[vert_index + vert_val][horz_index + 1] != "M") return false;
+        if (array_2d[vert_index + vert_val][horz_index - 1] != "M") return false;
+        if (array_2d[vert_index - vert_val][horz_index + 1] != "S") return false;
+        if (array_2d[vert_index - vert_val][horz_index - 1] != "S") return false;
+    }
+
+    if (check_up_down) {
+        if (array_2d[vert_index + 1][horz_index + horz_val] != "M") return false;
+        if (array_2d[vert_index - 1][horz_index + horz_val] != "M") return false;
+        if (array_2d[vert_index + 1][horz_index - horz_val] != "S") return false;
+        if (array_2d[vert_index - 1][horz_index - horz_val] != "S") return false;
+    }
+
+    return true;
+}
+
+int CheckFor2MAS(std::vector<std::vector<std::string>>& array_2d, int vert_index, int horz_index) {
+    int num_of_XMAS_words = 0;
+    for (int i = TOP; i < END_M; ++i) {
+        switch (static_cast<double_m>(i)) {
+            case TOP : { // VERT=1 HORZ=0
+                if (IsValidIndex2(vert_index, horz_index, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord2(array_2d, vert_index, horz_index, 1, 0)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case FRONT : { // VERT=0 HORZ=1
+                if (IsValidIndex2(vert_index, horz_index, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord2(array_2d, vert_index, horz_index, 0, 1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case BOTTOM : { // VERT=-1 HORZ=0
+                if (IsValidIndex2(vert_index, horz_index, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord2(array_2d, vert_index, horz_index, -1, 0)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            case BACK : { // VERT=0 HORZ=-1
+                if (IsValidIndex2(vert_index, horz_index, array_2d.size(), array_2d[0].size())) {
+                    if (IsWord2(array_2d, vert_index, horz_index, 0, -1)) num_of_XMAS_words++;
+                }
+                break;
+            }
+            default : std::cerr << "\nHow did I end up here?" << i << ""; break;
+        }
+    }
+    return num_of_XMAS_words;
+}
+
+int LoopThruLetters2(std::vector<std::vector<std::string>>& array_2d) {
+    int num_of_xmas = 0;
+    int vert_index = 0;
+    for (auto vert : array_2d) {
+        int horz_index = 0;
+        for (auto horz : vert) {
+            if (horz == "A") num_of_xmas += CheckFor2MAS(array_2d, vert_index, horz_index);
+            horz_index++;
+        }
+        vert_index++;
+    }
+    return num_of_xmas;
+}
+
+void ReadDataFromFile(const std::string& filename, std::vector<std::vector<std::string>>& array_2d) { // 2D array
+    std::ifstream inputFile(filename);
+    std::string line;
+
+    if (!inputFile) {
+        std::cerr << "Error: Unable to open file " << filename << std::endl;
+        return;
+    }
+
+    int vert_index = 0;
+    while (getline(inputFile, line, '\n')) {
+        int horz_index = 0;
+        std::vector<std::string> temp;
+        array_2d.push_back(temp);
+        for (auto letter : line) {
+            std::string tmp_str(1, letter);
+            array_2d[vert_index].push_back(tmp_str);
+            horz_index++;
+        }
+        vert_index++;
+    }
+
+    inputFile.close();
+}
+
+int LoopThruLetters(std::vector<std::vector<std::string>>& array_2d) {
+    int num_of_xmas = 0;
+    int vert_index = 0;
+    for (auto vert : array_2d) {
+        int horz_index = 0;
+        for (auto horz : vert) {
+            if (horz == "X") num_of_xmas += CheckForXMAS(array_2d, vert_index, horz_index);
+            horz_index++;
+        }
+        vert_index++;
+    }
+    return num_of_xmas;
+}
+
+int main() {
+    std::vector<std::vector<std::string>> array_2d;
+    ReadDataFromFile("../input.txt", array_2d);
+    std::cout << LoopThruLetters(array_2d) << std::endl;
+    std::cout << LoopThruLetters2(array_2d) << std::endl;
+}