#!/usr/bin/env sage -python
#
# RotationCipher: simple shift cipher (aka Caesar cipher)
#
# This accepts a string s and an integer r, and returns s with each
# alphabetic character replaced with the one appearing r letters later.
#
# Stephen Forrest, http://wandership.ca/

def RotationCipher(s,r):
    result = []
    for x in s:
        c = ord(x)
        if c >= 97 and c <= 122:
           d = chr( ((c-97+r) % 26) + 97 )
        elif c >= 65 and c <= 90:
           d = chr( ((c-65+r) % 26) + 65 )
        else:
           d = x
        result.append(d)
    return "".join(result)

print RotationCipher("Gaius Julius Caesar", 8)