L = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
S = input()
res = ""

for i in range(len(S)):
    pos = L.index(S[i])
    dec = (i + 1) % 26
    if pos - dec >= 0:
        res += L[pos-dec]
    else:
        res += L[26-abs(pos-dec)]

print(res)