a = input()

chrs = {chr(i): {chr(j) for j in range(97,123)} for i in range(97,123)}

print("? " + a + chrs[a].pop())
while (S := input())[0] != "!":
	chrs[S[2]].remove(S[3])
	print("? " + S[3] + chrs[S[3]].pop())