S = input()

LS = list(S)
ans_list = []       
alphabettonumber = []
cut = []

for i in LS:
    if 'A' <= i <= 'Z':
        number = ord(i) 
        alphabettonumber.append(number)

for i in range(0,len(S)):
    number2 = alphabettonumber[i] - ( i + 1 ) 
    cut.append(number2)

for i in cut:
    if 65 <= i <= 90:
        ans_list += chr(i)
    elif int(i) < 65:
        while i < 65:
            i += 26
        ans_list.append(chr(i))

if ans_list:
    print("".join(ans_list), end='')