encrypt and decrypt

# Caesar Cipher
# https://inventwithpython.com/hacking (BSD Licensed)

import pyperclip
import time
# every possible symbol that can be encrypted
LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*()-=_+ '
# tells the program to encrypt or decrypt
mode = input("\033[0;32m Enter the mode type : \n 01 : Encrypt \n 02 : Decrypt \n") # set to 'encrypt' or 'decrypt'
if mode == "01":
    mode="encrypt"
if mode == "02":
    mode="decrypt"


# The string to be encrypted/decrypted:
message = input("Enter the secret message : \n")

# the encryption/decryption key
key = int( input("Enter the key: - \033[0;31m you can't decrypt without the key! \033[0;32m -  \n") )




# stores the encrypted/decrypted form of the message
translated = ''

# capitalize the string in message
message = message.upper()

# run the encryption/decryption code on each symbol in the message string
for symbol in message:
    if symbol in LETTERS:
        # get the encrypted (or decrypted) number for this symbol
        num = LETTERS.find(symbol) # get the number of the symbol
        if mode == 'encrypt':
            num = num + key
        elif mode == 'decrypt':
            num = num - key

        # handle the wrap-around if num is larger than the length of
        # LETTERS or less than 0
        if num >= len(LETTERS):
            num = num - len(LETTERS)
        elif num < 0:
            num = num + len(LETTERS)

        # add encrypted/decrypted number's symbol at the end of translated
        translated = translated + LETTERS[num]

    else:
        # just add the symbol without encrypting/decrypting
        translated = translated + symbol

# print the encrypted/decrypted string to the screen
print(translated)

# copy the encrypted/decrypted string to the clipboard
pyperclip.copy(translated)
x = 0
while x<=3:
    wait = input("Enter anything to exit \n Enter \'n\' to wait \n")
    if wait == "n":
        print("Wating... \n")
        time.sleep(4)
    else:
        print ("Goodbye...")
        break

    x=x+1