import sequtils,strutils,math

var
    S = stdin.readline
    a : int
    A = ord('A')
    

for i,s in S:
    a = ord(s)
    a -= A
    a -= i + 1
    a = a - floor(a.float / 26.float).int * 26
    a += A
    S[i] = chr(a)

echo S