S = input()
l1 = list(S)
N1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
l = list(N1)
ans = ""
ck = 0

for i in range(len(l1)):
    ck = l.index(l1[i]) - (i + 1)
    while ck < -26:
        ck += 26
    ans += l[ck]

print(ans)