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

goroutine 1 [running]:
main.main.func2(...)
	/tmp/cf-worker-2601869589/main.go:105
main.main()
	/tmp/cf-worker-2601869589/main.go:121 +0x11a4

input:
3 2
B 2 R 2
L 2 R 3
T 2 L 3
B 1 R 1
L 1 T 1