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