import sys
s=input()
def mod(n):
    if n<0:
        return 26+n
    return n%26
c_array=[chr(i) for i in range(ord('A'),ord('Z')+1)]
for i in range(1,len(s)+1):
    sys.stdout.write(c_array[mod(c_array.index(s[i-1])-i)])