text: 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']
  
  def caesar(start_text, shift_amount, cipher_direction):
    end_text = ""
    if cipher_direction == "decode":
      shift_amount *= -1
    for char in start_text:
      if char in alphabet:
        position = alphabet.index(char)
        new_position = position + shift_amount
        end_text += alphabet[new_position]
      else:
        end_text += char
          
    print(f"Here's the {cipher_direction}d result: {end_text}")
  
  
  from art import logo
  print(logo)
  
  should_continue = True
  
  while should_continue:
    direction = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")
    text = input("Type your message:\n").lower()
    shift = int(input("Type the shift number:\n"))
    shift = shift % 26
    caesar(start_text=text, shift_amount=shift, cipher_direction=direction)
  
    user_decision = input("Type 'yes' if you want to go again. Otherwise, type 'no' \n").lower()
    if user_decision == 'no':
      should_continue = False
      print("Goodbye!")
  
  