print('''
-------------------------------------------------------------
 To decrypt what you encrypted ,use the negative of the shift
 value you entered to encrypt your message.
 If you used a shift value of "3" to encrypt your message,
 then use -3 to decrypt your message.
 ------------------------------------------------------------
''')

stop = 'no'

# This is our cipher function where our encryption/decryption code will be
def cipher(message, shift):

    encrypted_message = ""
    #we will use the ascii values starting from blankspace to "~"
    #so that we can include most of the characters in our keyboard
    for char in message:
        if char >= " " and char <= "~":
            position = ord(char) - ord(" ") #ord() will return the integer position of the character in the ascii table
            position = (position + shift) % 95
            new_char = chr(position + ord(" "))
            encrypted_message += new_char
    print("The encrypted message is: ", encrypted_message)

# This is our condition to check if a user want to continue decrypting and encrypting
while stop == 'no':

        message = input("Hello there, enter the message you want to encrypt/decrypt: ")
        shift = int(input("enter the shift value u want: "))

        cipher(message, shift)

        again = input("do you want to continue to encrypt/decrypt ").lower()

        if again == 'yes':
            continue
        else:
            print("\n Thanks for using me! Till next time, Cya")
            stop = 'yes'