摘苹果：
4 = 4 7 < 8 9 < 10 6 < 9
4 < 6 9 > 7 6 < 9 10 > 7
8 > 6 10 > 9 10 > 1 0 <10
9 > 8 6 = 6 4 < 8 4 < 7
0 < 2 5 > 0 6 < 7 2 < 3
