php, 98 bytes

Result

AC

Duration

1058ms

Code [DL]

<?php for($y=$h=+fgets(STDIN),$w=fgets(STDIN)-2;$y;)echo"*",str_repeat("* "[$y--<$h&&$y],$w),"*
";

stdin

57
12

stdout

************
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
*          *
************

stderr

PHP Notice:  A non well formed numeric value encountered in /volume/CODE on line 1
PHP Notice:  A non well formed numeric value encountered in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1
PHP Notice:  String offset cast occurred in /volume/CODE on line 1