a = str(input())
ans = set([])
print("?", a * 2)
ans.add(a * 2)
while 1:
  _, S = map(str, input().split())
  if S in ans:
    print("!", "WIN")
    exit()
  else:
    ans.add(S)
  print("?", S[-1] + a)
  ans.add(S[-1] + a)
  if len(ans) == 51:
    print("!", "WIN")
    exit()