for i in range(25):
        start_time = time.time()
        play2win(build_tree("a"), 'AE' * 13, 'qwertyuiopasdfghjklzxcvbnm', "0" * (25 - i))
        elapsed_time = time.time() - start_time
        print("run in " + str(elapsed_time) + " s")