# -*- coding:utf-8 -*-
import sys
a=u"abcçdefgğhıijklmnoöprsştuüvyz"
print "".join([a[(a.index(x[1])+ ((sys.argv[3]=="e" and 1 or -1)*(a.index(sys.argv[2][x[0]%len(str(sys.argv[2]))]))))%29] for x in enumerate(open(sys.argv[1],'r').read().decode("utf-8").strip())])