from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

S = list(input())[:-1]

def f(x,i):
    return chr((ord(x)-ord('A')-i)%26+ord('A'))
    
    
S = [f(a,i+1) for i,a in enumerate(S)]
print(''.join(S))