S = input()
a = 0
ans = []
for x in S :
    a += 1

    if ord(x) - a >= ord('A') :
        ans.append(chr(ord(x) - a))

    elif a <= 25 :
        ans.append(chr(ord(x) - (a%26) + 26))
    else :
        ans.append(chr((ord(x) - a) + (a//26)*26))
print(''.join(ans))