a = input()
s = ''

for i in range(len(a)):
    ord_s = ord(a[i]) - ((i % 26) + 1)
    #if i == 25:
    #    print('i = ', i, ':', ord_s)
    if ord_s < ord('A'):
        ord_s += 26
    if ord_s > ord('Z'):
        ord_s -= 26
    s += chr(ord_s)

print(s)