diff --git a/2022-Oct/03 Oct 2022/dev_zohaib.py b/2022-Oct/03 Oct 2022/dev_zohaib.py
new file mode 100644
index 00000000..681d25e3
--- /dev/null
+++ b/2022-Oct/03 Oct 2022/dev_zohaib.py	
@@ -0,0 +1,26 @@
+def convert_case(input_str: str) -> str:
+    """
+    Problem:  Accept a String from user & convert uppercase letter into
+    lowercase letter and vice versa
+
+    input : "Hello World"
+    output: "hELLO wORLD"
+
+    :param input_str:
+    :return: str
+    """
+    new_str = ''
+    for i in input_str:
+        if i.isupper():
+            new_str += i.lower()
+        elif i.islower():
+            new_str += i.upper()
+        else:
+            new_str += i
+    return new_str
+
+
+# Driver Code
+if __name__ == '__main__':
+    input_str = input("Input: ")
+    print("Output: ", convert_case(input_str))