key = 13

message = input("What is your message?")

for i in message:

    ascii_value = ord(i)

    ascii_value = ascii_value + key

    new_letter = chr(ascii_value)

    print(new_letter, end = "")

decode = ""

for j in range(1,27):

    for i in decode:

        ascii_value = ord(i)

        ascii_value = ascii_value - j

        new_letter = chr(ascii_value)

        print(new_letter, end = "")

    print()

##Cipher

from random import randint

key = randint(1,27)

message = input("What is your message?")

for i in message:

    ascii_value = ord(i)

    if (ascii_value >= 65 and ascii_value <= 90) or (ascii_value >= 97 and ascii_value <= 122): 

        if ascii_value + key > 90 and ascii_value <= 90:

            ascii_value = (ascii_value + key - 90) + 64

        elif ascii_value + key > 122:

            ascii_value = (ascii_value + key - 122) + 96

        else:

            ascii_value = ascii_value + key

        new_letter = chr(ascii_value)

        print(new_letter, end = "")

    else:

        print(i , end = "")

def decode(message):

    for j in range(1, 27):

        key = j

        for i in message:

            ascii_value = ord(i)

            if (ascii_value >= 65 and ascii_value <= 90) or (ascii_value >= 97 and ascii_value <= 122): 

                if ascii_value - key < 65:

                    ascii_value = 91 - (65 - (ascii_value - key))

                elif ascii_value - key < 97 and ascii_value >= 97:

                    ascii_value = 123 - (97 - (ascii_value - key))

                else:

                    ascii_value = ascii_value - key

                new_letter = chr(ascii_value)

                print(new_letter, end = "")

            else:

                print(i , end = "")

        print()