secret = 17
nessage = "hello world"

output = ""

for character in message:
    if character in alphabet:
        output = output + encode(character, secret)
    else:
        output = output + character

print(output)

secret = 17
message = "yvååc kcfåu"
output = ""

for character in message:
    if character in alphabet:
        output = output + decode(character, secret)
    else:
        output = output + character

print(output)