bash-busybox, 201 bytes

Result

WA

Duration

1224ms

Code [DL]

read a
read b
for i in `seq 1 $a`; do
  for j in `seq 1 $b`; do
    if [[ ($i == 1 || $i == $a) || ($j == 1 || $j == $b) ]]; then
      echo -n '*'
    else
      echo -n ' '
    fi
  done
  echo
done

stdin

10
56

stdout

stderr

/code.bash: line 3: seq: command not found