1014. Box

单点时限: 2.0 sec

内存限制: 256 MB

Ivan works at a factory that produces heavy machinery. He has a simple job – he knocks up wooden boxes of different sizes to pack machinery for delivery to the customers. Each box is a rectangular parallelepiped. Ivan uses six rectangular wooden pallets to make a box. Each pallet is used for one side of the box.

Joe delivers pallets for Ivan. Joe is not very smart and often makes mistakes – he brings Ivan pallets that do not fit together to make a box. But Joe does not trust Ivan. It always takes a lot of time to explain Joe that he has made a mistake.

Fortunately, Joe adores everything related to computers and sincerely believes that computers never make mistakes. Ivan has decided to use this for his own advantage. Ivan asks you to write a program that given sizes of six rectangular pallets tells whether it is possible to make a box out of them.

输入格式

Input consists of six lines. Each line describes one pallet and contains two integer numbers w and h (1 <= w, h <= 10 000) – width and height of the pallet in millimeters respectively.

输出格式

Write a single word “POSSIBLE” to the output file if it is possible to make a box using six given pallets for its sides. Write a single word “IMPOSSIBLE” if it is not possible to do so.

样例

Input
1345 2584
2584 683
2584 1345
683 1345
683 1345
2584 683
Output
POSSIBLE

101 人解决,140 人已尝试。

121 份提交通过,共有 320 份提交。

3.5 EMB 奖励。

创建: 15 年,7 月前.

修改: 3 年,2 月前.

最后提交: 7 月,3 周前.

来源: Northeastern Europe 2004

题目标签
3d