import string

URL = 'http://www.pythonchallenge.com/pc/def/map.html'

SECRET = ("g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq "
          "ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw "
          "rfgq rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq "
          "pcamkkclbcb. lmu ynnjw ml rfc spj.")

ASCII_ALPHABET = string.ascii_lowercase


def shift_chars(riddle_string, shift_by_int):
    # Shift only between ord 96 and 121
    shifted_string = ''
    for char in riddle_string:
        char_value = ord(char)
        if char_value >= ord(ASCII_ALPHABET[-1]) - 1:
            shifted_string += chr(ord(char) -
                                  len(ASCII_ALPHABET) + shift_by_int)
        elif char_value <= ord(ASCII_ALPHABET[0]) - 1:
            shifted_string += char
        else:
            shifted_string += chr((ord(char)) + shift_by_int)
    return shifted_string


def main():
    shifted_secret = shift_chars(SECRET, 2)
    print('Shifted secret:', shifted_secret)
    shifted_url = shift_chars(URL, 2)
    print('Shifted url:', shifted_url)
    new_url = URL.replace('map', shifted_url.split('/')[-1][:3])
    print('New url:', new_url)




if __name__ == '__main__':
    main()