5 10

a	b	c	d	e	f	g	h	i	j

0	1	2	-1	0	-1	-1	4	0	4
-1	-1	-1	4	2	-1	0	2	1	1
4	2	4	4	4	-1	1	0	0	-1
2	0 	1	4	2	-1	2	2	2	2
0	1	-1	2	4	-1	4	4	4	4

4 3