diff --git a/compare.py b/compare_int.py
similarity index 100%
rename from compare.py
rename to compare_int.py
diff --git a/compare_string.py b/compare_string.py
new file mode 100644
index 0000000..bfc3c7c
--- /dev/null
+++ b/compare_string.py
@@ -0,0 +1,6 @@
+s = input("s? ")
+
+t = s.capitalize()
+
+print(f"s: {s}")
+print(f"t: {t}")
\ No newline at end of file
diff --git a/exit.py b/exit.py
new file mode 100644
index 0000000..6a98daf
--- /dev/null
+++ b/exit.py
@@ -0,0 +1,10 @@
+import sys
+
+if len(sys.argv) < 2:
+    print("Missing command-line argument!")
+    sys.exit(1)
+
+for arg in sys.argv[1:]:
+    print(f"Hello {arg}!")
+    
+sys.exit(0)
\ No newline at end of file
diff --git a/greet.py b/greet.py
new file mode 100644
index 0000000..34a6b53
--- /dev/null
+++ b/greet.py
@@ -0,0 +1,7 @@
+from sys import argv
+
+if len(argv) > 1:
+    for arg in argv[1:]:
+        print(f"Hello {arg}!")
+else:
+    print("Hello World!")
\ No newline at end of file
diff --git a/mario.py b/mario.py
new file mode 100644
index 0000000..0ee60c5
--- /dev/null
+++ b/mario.py
@@ -0,0 +1,15 @@
+def main():
+    height = get_height()
+    for i in range(height):
+        print("#")
+
+def get_height():
+    while True:
+        try:
+            n = int(input("Height?: "))
+        except ValueError:
+            print("ValueError: Not an integer!")
+        else:
+            if n > 0: return n
+
+main()
\ No newline at end of file
diff --git a/mario2.py b/mario2.py
new file mode 100644
index 0000000..a86ad3d
--- /dev/null
+++ b/mario2.py
@@ -0,0 +1,4 @@
+from cs50 import get_int
+
+width = get_int("Width?: ")
+print("?" * width)
\ No newline at end of file
diff --git a/mario3.py b/mario3.py
new file mode 100644
index 0000000..22ceeb7
--- /dev/null
+++ b/mario3.py
@@ -0,0 +1,7 @@
+from cs50 import get_int
+
+height = get_int("Height?: ")
+width = get_int("Width?: ")
+
+for i in range(height):
+    print("#" * width)
\ No newline at end of file
diff --git a/names.py b/names.py
new file mode 100644
index 0000000..760bedc
--- /dev/null
+++ b/names.py
@@ -0,0 +1,12 @@
+import sys
+
+names = ["Bill", "Charlie", "Fred", "George", "Ginny", "Percy", "Ron"]
+
+name = input("Name: ")
+
+if name in names:
+    print("found")
+    sys.exit(0)
+
+print("not found")
+sys.exit(1)
\ No newline at end of file
diff --git a/phonebook.csv b/phonebook.csv
new file mode 100644
index 0000000..4ee7730
--- /dev/null
+++ b/phonebook.csv
@@ -0,0 +1,6 @@
+name,number
+David,+1-949-468-2750
+Carter,+1-617-495-1000
+Sascha,+49-163-9681131
+Ina,+49-175-4038108
+Agilent,+49-176-22285334
diff --git a/phonebook.py b/phonebook.py
new file mode 100644
index 0000000..804da80
--- /dev/null
+++ b/phonebook.py
@@ -0,0 +1,9 @@
+import csv
+
+with open("phonebook.csv", "a") as file:
+    
+    name = input("Name: ")
+    number = input("Number: ")
+
+    writer = csv.DictWriter(file, fieldnames=["name", "number"])
+    writer.writerow({"name": name, "number": number})
\ No newline at end of file
diff --git a/scores.py b/scores.py
new file mode 100644
index 0000000..1c7cce4
--- /dev/null
+++ b/scores.py
@@ -0,0 +1,12 @@
+from cs50 import get_int
+
+scores = []
+
+while True:
+    score = get_int("Score?: ")
+    if score == 0: break
+    scores.append(score)
+
+print(f"Scores: {scores}")
+average = sum(scores) / len(scores)
+print(f"Average: {average}")
\ No newline at end of file
diff --git a/speech.py b/speech.py
new file mode 100644
index 0000000..b327277
--- /dev/null
+++ b/speech.py
@@ -0,0 +1,6 @@
+import pyttsx3
+
+engine = pyttsx3.init()
+name = input("Name: ")
+engine.say(f"hello {name}!")
+engine.runAndWait()
\ No newline at end of file
diff --git a/swap.py b/swap.py
new file mode 100644
index 0000000..6148c5d
--- /dev/null
+++ b/swap.py
@@ -0,0 +1,6 @@
+x = 1
+y = 2
+
+print(f"x is {x}, y is {y}")
+x, y = y, x
+print(f"x is {x}, y is {y}")
\ No newline at end of file
diff --git a/uppercase.py b/uppercase.py
new file mode 100644
index 0000000..8f07f21
--- /dev/null
+++ b/uppercase.py
@@ -0,0 +1,3 @@
+before = input("Before: ")
+after = before.upper()
+print(f"After: {after}")
\ No newline at end of file