1 1 1 1 1 1 1 1 u u u 1 1
1 u u u 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 s 1 1
1 1 1 1 1 u u u P 1 u u 1 1 1 1 1 1 u u u u u u u u u 1 1
1 u u u 1 1 1 1 1 1 1 1 1 1 1 1 1
P 1 1 st