a = 0
ans = []
for x in input() :
    a += 1
    if a%26 == 0 :
        ans.append(x)
    elif ord(x) - a%26 >= ord('A') :
        ans.append(chr(ord(x) - a%26))
    else :
        L = chr((ord(x) - a%26) + 26)
        ans.append(L)
print(''.join(ans))