{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"![](http://images.cnblogs.com/cnblogs_com/jiaangk/1202813/t_TIM%E5%9B%BE%E7%89%8720180425155943%20(2).jpg)\n\ninput\n\n```\n1\n3 6 7\n1 7 5 4 8 3 9\n1 4 3 5 6 2 8 9\n```\n\noutput\n\n```\nCase 1: 4\n```"}}]}