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import string as st

letter_list=st.ascii_lowercase

alphabet=[letter for letter in letter_list]*2

def caesar(text1, shift1, direction1):

end_text = ''

if direction=='decode':

shift1 *= -1

for char in text1:

if char in alphabet:

position = alphabet.index(char)

new_position = position + shift1

end_text += alphabet[new_position]

else:

end_text += char

print(f'The {direction1}d text is: {end_text}.')

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 % 25

caesar(text, shift, direction)

choice=input("Type 'yes' to continue otherwise type 'no'.\n")

if choice == 'no':

should_continue=False