alpha = "".join([chr(ord('A')+i) for i in range(26)])

def shift(c, n):
    n = n % 26
    cord = alpha[-n:] + alpha[:-n]
    return cord[alpha.index(c)]
    
s = input().strip()

ret = ""
for i, c in enumerate(s):
    ret += shift(c, i+1)
print(ret)