S = input()
l = ['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']
result = ""
for i in range(S):
	if l[i%26] == S[i]:
		result += l[(i%26)-((i+1)%26)]
			
print(result)