node, 165 bytes

Result

WA

Duration

1049ms

Code [DL]

a=[];p=process.stdin;ps.resume();p.on('data',s=>a.push(Number(s)));p.on('end',()=>{for(i=0;i<a[0];i++)console.log('*'+(i==0||i==a[0]-1?'*':' ').repeat(a[1]-2)+'*')})

stdin

49
74

stdout

stderr

/volume/CODE:1
(function (exports, require, module, __filename, __dirname) { a=[];p=process.stdin;ps.resume();p.on('data',s=>a.push(Number(s)));p.on('end',()=>{for(i=0;i<a[0];i++)console.log('*'+(i==0||i==a[0]-1?'*':' ').repeat(a[1]-2)+'*')})
                                                                                   ^

ReferenceError: ps is not defined
    at Object.<anonymous> (/volume/CODE:1:84)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
    at startup (internal/bootstrap/node.js:282:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)