#入力受け取り
def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	S = list(input())
	n = len(S)
	ans = ""
	for i in range(n):
		ans += chr(65 + ((ord(S[i]) - 66 - i) % 26))
	print(ans)

if __name__ == '__main__':
	main()