Code for Caesar cipher program

cipher.py

@@ -1 +1,41 @@
-# add your code here
+substitution = {
+    "a": "f",
+    "b": "g",
+    "c": "h",
+    "d": "i",
+    "e": "j",
+    "f": "k", 
+    "g": "l",
+    "h": "m",
+    "i": "n",
+    "j": "o",
+    "k": "p",
+    "l": "q",
+    "m": "r", 
+    "n": "s", 
+    "o": "t", 
+    "p": "u", 
+    "q": "v", 
+    "r": "w", 
+    "s": "x", 
+    "t": "y", 
+    "u": "z", 
+    "v": "a", 
+    "w": "b", 
+    "x": "c",
+    "y": "d", 
+    "z": "e", 
+}
+
+plain_text = input("Please enter the message you'd like to encrypt: ")
+plain_text = plain_text.lower()
+
+encrypted_text = ""
+for character in plain_text:
+    if character in substitution: 
+        character = substitution[character]
+    encrypted_text += character
+
+print(encrypted_text)
+
+