import string 

alpha = list(string.ascii_uppercase)

S = input()
ans =''

for i,s  in enumerate(S):
    i=i+1
    if i > 26:
        i = i % 26
    f=alpha.index(s)
    if f - i >= 0:
        ans += alpha[f-i]
    else:
        ans += alpha[f-i+26]
print(ans)