scheme-guile, 158 bytes

Result

AC

Duration

1072ms

Code [DL]

(let* ((y (read))(x (read))(m make-string)(a append)(s (list (m (- x 1) #\*)))(k (string-join (a s (make-list (- y 2) (m (- x 2) #\ )) s)"*\n*")))(display k))

stdin

55
99

stdout

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stderr

;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;;       or pass the --no-auto-compile argument to disable.
;;; compiling /volume/CODE
;;; compiled /root/.cache/guile/ccache/2.0-LE-8-2.0/volume/CODE.go