S = list(input())

import string
A_Z = list(string.ascii_uppercase)

indA = 0

result = ''
indS = -1

for i in S:
    indA_Z = A_Z.index(i)
    indS = indS + 1
    indR = indA_Z - (indS + 1)
    if indR < 0:
        indR = indR + 26 * ((abs(indR) - 1 ) // 26 + 1)
        result = result + A_Z[indR]
    else:
        result = result + A_Z[indR]
print(result)