diff --git a/python/s1/s1_a1_3.pdf b/python/s1/s1_a1_3.pdf
new file mode 100644
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diff --git a/python/s1/s1_a51.py b/python/s1/s1_a51.py
new file mode 100644
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+++ b/python/s1/s1_a51.py
@@ -0,0 +1,4 @@
+import numpy as np
+a=np.array([[3,0,-2,11],[0,0,9,0],[0,7,0,0],[0,0,0,-3]])
+
+print(a)
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diff --git a/python/s1/s1_a52.pdf b/python/s1/s1_a52.pdf
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diff --git a/python/s1/s1_a53_6.py b/python/s1/s1_a53_6.py
new file mode 100644
index 0000000..79da687
--- /dev/null
+++ b/python/s1/s1_a53_6.py
@@ -0,0 +1,48 @@
+print("Aufgabe 3:")
+
+liste = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+
+print("Liste: ", liste)
+
+a = liste[-1]
+b = liste[-2]
+c = liste[-3]
+
+liste = [a] + liste
+liste = [b] + liste
+liste = [c] + liste
+
+for x in range(3):
+    liste.pop(-1)
+
+print("Liste neu:", liste)
+
+print()
+print("Aufgabe 4:")
+
+strings="Donaudampfschiffahrtsgesellschaftsstewardess"
+x=list(strings)
+
+resultantList = []
+
+print(x)
+
+print("Länge der Liste:", len(x))
+
+for element in strings:
+    if element not in resultantList:
+        resultantList.append(element)
+
+print(resultantList)
+
+print("Länge der Liste ohne Duplikate:", len(resultantList))
+
+print()
+print("Aufgabe 5:")
+
+def sort(sub_li):
+    sub_li.sort(key = lambda x: x[1]) 
+    return sub_li 
+  
+sub_li =[[1, 2, 3], [2, 1, 3], [4, 0, 1]]
+print(sort(sub_li))
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diff --git a/python/s1/s1_a61_2.py b/python/s1/s1_a61_2.py
new file mode 100644
index 0000000..0ad379a
--- /dev/null
+++ b/python/s1/s1_a61_2.py
@@ -0,0 +1,9 @@
+s = "This is a test"
+new_s = s.replace(' ','-')
+print(new_s)
+
+s1 = "Hello, World"
+
+s1split = s1.split(",")
+
+print(''.join(reversed(s1split)))
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diff --git a/python/s2/README b/python/s2/README
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index 0000000..e69de29