diff --git a/Aufgabe 5.py b/Aufgabe 5.py
deleted file mode 100644
index 78ce1f4..0000000
--- a/Aufgabe 5.py	
+++ /dev/null
@@ -1,2 +0,0 @@
-if __name__ == '__main__':
-    print("test")
\ No newline at end of file
diff --git a/s1_a51.py b/s1_a51.py
new file mode 100644
index 0000000..639d6a8
--- /dev/null
+++ b/s1_a51.py
@@ -0,0 +1,52 @@
+class MyMatrix:
+    # Constructor - parameterized
+    row = 0
+    column = 0
+    matrix = {}
+
+    def __init__(self, list):
+        self.row = len(list)
+        self.column = len(list[0])
+        test = len(list[0])
+        for i in range(len(list)):
+            if  len(list[i]) != test:
+                raise Exception('Not a matrix')
+        dictionary = {}
+        for i in range(self.column):
+            for j in range(self.row):
+                if (list[i][j] == 0):
+                   continue
+                dictionary[i*self.column + j] = list[i][j]
+
+        self.matrix = dictionary
+
+    def __str__(self):
+       for i in range((self.row) *(self.column)):
+            if i % self.column == 0:
+                print("|  ",end="")
+            if i in self.matrix:
+                print(f"{self.matrix[i]}    ",end="")
+            else:
+                print("0    ",end="")
+            if i % self.column == self.column -1:
+                print("|\n",end="")
+
+    def __getitem__(self, packing):
+        column2,row1 = packing
+        if  column2 > self.column or row1 > self.row:
+            raise Exception('Outside of Bounds')
+        if column2*self.column + row1 in self.matrix:
+            return self.matrix[column2*self.column + row1]
+        else:
+            return 0
+
+
+
+
+m = [[3,0,-2,11],[0,0,9,0],[0,7,0,0],[0,0,0,-3]]
+object = MyMatrix(m)
+object.__str__()
+#Wir haben keine Lösung mitm[0][0]= 3, da __getitem__ nur ein Argument nimmt
+x = object[0,0]
+
+print(x)