Could someone give a tricky test case, is there any? I am getting WA at test case #24. Here are some random tests that my solution gives

12 7
18
LLRLFFFFFLFLFFFFFF

3 3
Atawazu

1 8
4
LLLL

13 25
36
LLRLRLRLRLRLFFFFFFLLRLRLRLRLRLFFFFFF

10 10
20
LLRLRLFFFFLLRFLFFFFF

23 5
26
LLFFFFFFFFFFFLLFFFFFFFFFFF

23 6
28
LLRLFFFFFFFFFFLFLFFFFFFFFFFF

Thanks.