Day 8 - Caesar Cipher.2

alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

direction = input("Type 'encode' to encrypt, type 'decode' to decrypt: ").lower()
text = input("Type your message: ").lower()
shift = int(input("Type the shift number:"))

def caesar(direction_, text_, shift_):
    end_text = ""
    if direction == "decode":
        shift_ *= -1
    for letter in text_:
        position = alphabet.index(letter)
        new_position = position + shift_
        end_text += alphabet[new_position]
    print(f"The {direction}d text is {end_text}")

caesar(direction, text, shift)