apl, 116 bytes

Result

AC

Duration

1020ms

Code [DL]

a←⎕ARG
b←a[6]
bs←⍕b
h←⍎(bs[2 3])
w←⍎(bs[5 6])
wρ"*"
(h-2) w ρ ("*",((w-2)ρ" "),"*")
wρ"*"
)OFF

stdin

35
41

stdout

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

stderr

Executable /usr/bin/APs/APserver not found.
This could means that 'apl' was not installed ('make install') or that it
was started in a non-standard way. The expected location of APserver is 
either the same directory as the binary 'apl' or the subdirectory 'APs' of
that directory (the directory should also be in $PATH).
Svar_DB not connected in Svar_DB::is_registered_id()