anls=""
for i in range(1024):
	anls += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

instr=input()
preidex=[]
for i in range(len(instr)):
	preidex.append(anls.find(instr[i]))#Bが入力されたら1

for i in range(len(instr)):
	print(anls[preidex[i]-(i+1)],end="")
print()