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the solution:
1
6
8
9
7
2
3
5
4
7
5
2
1
3
4
6
8
9
3
9
4
6
5
8
2
1
7
5
2
9
8
6
1
4
7
3
8
7
6
2
4
3
1
9
5
4
1
3
7
9
5
8
6
2
2
3
1
5
8
7
9
4
6
6
4
7
3
1
9
5
2
8
9
8
5
4
2
6
7
3
1