def main():
    start = input()
    print(f"? {start*2}", flush=True)
    used = set((start*2, ))
    while True:
        res, arg = input().split()
        if res == "!":
            return
        used.add(arg)
        print(f"? {arg[-1]}{start}", flush=True)


if __name__ == "__main__":
    main()