ocaml, 167 bytes

Result

TLE

Code [DL]

let()=let a=read_int()in let b=read_int()in let rec l(i)=if i=1||i=a then print_endline(String.make b '*')else print_endline("*"^String.make(b-2)' '^"*");l(i+1)in l(1)

stdin

32
53

stdout

stderr