case 1 failed: runtime error: exit status 2
panic: runtime error: index out of range [23] with length 23

goroutine 1 [running]:
main.main()
	/tmp/build-6730025/solution.go:48 +0x574

input:
3 26
...-.SS.-...
...-...S-S.S
..S-....-..S
exit status 1