s = list(input())
for i in range(len(s)):
    moveCnt = (i+1) % 26
    idx = ord(s[i])
    if idx - moveCnt < 65:
        idx = idx + 26 - moveCnt
    else:
        idx = idx - moveCnt
    s[i] = chr(idx)
for c in s:
    print(c, end='')
print()