Cry

# To Implement Mono Cipher using a Key

alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
key = "QWERTYUIOPASDFGHJKLZXCVBNM"

plain = input("Enter Plain Text: ").upper()
cipher = ""

for ch in plain:
    if ch in alphabet:
        cipher += key[alphabet.index(ch)]
    else:
        cipher += ch

print("Encrypted:", cipher)

decrypt = ""

for ch in cipher:
    if ch in key:
        decrypt += alphabet[key.index(ch)]
    else:
        decrypt += ch

print("Decrypt:", decrypt)