#!/usr/bin/python3
# -*- coding: utf-8 -*-

key: int = int(input("\nEnter your Caesar key in numeric form (1-25): "))
mode: int = int(input("\nEnter 1 for encryption, and 0 for decryption: "))

character: int = int(
    input("\nEnter the Caesar encoding of the first character of your message: ")
)
while character != -1:
    print("\tYour letter translated to:")
    # Does using a loop help here? If yes, why? If no, why?
    if mode == 1:
        # 26 is the symbol set size (# letters in alphabet)
        print("\t", (character + key) % 26)
    else:
        print("\t", (character - key) % 26)
    character = int(
        input("\nEnter the Caesar encoded next character, or -1 for done: ")
    )

print("\nend of Caesar encoded message\n")