cesar.py

#coding: utf-8

LAT = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
        'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']

CODE = """
FUBSWRJUDSKLF NHBV DUH DQDORJRXV WR WKH KRXVH DQG FDU NHBV ZH FDUUB LQ RXU
GDLOB OLYHV DQG VHUYH D VLPLODU SXUSRVH
"""

#k == 3
#CRYPTOGRAPHIC KEYS ARE ANALOGOUS TO THE HOUSE AND CAR KEYS WE CARRY IN OUR DAILY LIVES AND SERVE A SIMILAR PURPOSE

for k in xrange(1, 100):
    result = ''
    for c in CODE:
        if c in LAT:
            code = LAT.index(c)
            x = (code - k + len(LAT)) % len(LAT)
            result += LAT[x]
        else:
            result += ' '

    print k, " ", result