st=input()
s=st
S=set(list("qwertyuiopasdfghjklzxcvbnm"))
while 1:
	for e in S:
		ans=s[-1]+st
		break
	S-={e}
	print("?",ans,flush=1)
	f,s=map(str,input().split())
	
	if f=="!":
		exit()