dic = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",]
text = input()
org_txt = ""
for i in range(len(text)):
    org_txt += dic[dic.index(text[i])-i%26-1]
print(org_txt)