import string
a = list(input())
b=list(string.ascii_uppercase)
b.reverse()
e = 1
f = ""
for i in a:
    d=(b.index(i)) + e
    if d < 25:
        f += b[d]
    else :
        while d >= 26:
            d -= 26
        f += b[d]
            
    e += 1
print(f)