alphabets=list("abcdefghijklmnopqrstuvwxyz")

def ceaser(direction,plain_text,shift_amount):

end_text=""

for char in plain_text:

if char in alphabets:

if direction=="encode":

position=alphabets.index(char)

new_position=(position+shift_amount)%25

elif direction=="decode":

position=alphabets.index(char)

new_position=(position-shift_amount)%25

end_text+=alphabets[new_position]

else:

end_text+=char

print(end_text)

repeat=True

while repeat:

ceaser_direction=input("Type encode, for encoding and decode, for decoding\n")

text=input("Enter the text\n");

shift=int(input("Enter the shift number\n"))

ceaser(direction=ceaser_direction,plain_text=text,shift_amount=shift)

again=input("Yes for reapeating no for exit\n")

if (again=="no"):

repeat=False