a = list(input())
j = 1
for i in range(len(a)):
    while True:
        if (ord(a[i]) - j) < ord("A"):
            a[i] = chr(ord(a[i]) + 26)
        else:
            a[i] = chr(ord(a[i]) - j)
        if ord("A") <= ord(a[i]) and ord(a[i]) <= ord("Z"):
            break
    print(a[i], end="")
    j += 1
print("")