2636. Bomb Game

单点时限: 2.0 sec

内存限制: 256 MB

John and Jack, two mathematicians, created a game called “Bomb Game” at spared time. This game is played on an n*m chessboard. A pair of integers (p, q) represents the grid at row p, column q. Some bombs were placed on the chessboard at the beginning. Every round, a player can choose to explode a bomb located at (p, q), and the exploded bomb will disappear. Furthermore:

1.If p>1 and q>1, the bomb will split up into two bombs located at (u, q) and (p, v), u<p, v<q, u and v are chosen by the player.

2.If p=1 and q>1, one new bomb will be produced, located at (p, v), v<q, v can be chosen freely by the player.

3.If q=1 and p>1, one new bomb will be produced, located at (u, q), u<p, u can be chosen freely by the player.

If two bombs located at the same position or a bomb located at (1, 1), they will be exploded automatically without producing new bombs.

Two players play in turn, until one player cannot explode the bombs and loses the game.

John always plays first.

Now, we’ll give you an initial situation, and you should tell us who will win at last. Assume John and Jack are smart enough, and they always do the best choice.

输入格式

There are several test cases, each one begins with two integers n and m, 0<n, m<=50, represents the number of rows and columns. Following by an n*m grid, describing the initial situation, ‘#’ indicates a bomb.

The input is terminated by n=m=0.

输出格式

For each test case, output one line, the name of the winner.

样例

Input
2 2
.#
..
2 2
.#
.#
0 0
Output
John
Jack

0 人解决,0 人已尝试。

0 份提交通过,共有 0 份提交。

9.9 EMB 奖励。

创建: 11 年前.

修改: 2 年,11 月前.

最后提交: N/A.

来源: 多校联合比赛BNU站

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