lua, 79 bytes

Result

WA

Duration

1011ms

Code [DL]

h,w=io.read(2,3)for y=1,h do print("*"..(1==y%-~hand"*"or" "):rep(w-2).."*")end

stdin

99
31

stdout

stderr

/usr/bin/lua5.3: /volume/CODE:1: attempt to call a nil value (global 'hand')
stack traceback:
	/volume/CODE:1: in main chunk
	[C]: in ?