#include<iostream>
using namespace std;

int main(){
	int H, W;
	while(1){
	cin >> H >> W;
	if( H == 0 && W == 0 ) return 0;
	for( int i = 0; i < H; i++ ){ 
	for( int j = 0; j < W; j++ ){ if( i == 0 || i == H - 1 || j == 0 || j == W - 1 ){ cout << "#"; }else{ cout << "."; }  }
	cout << "\n";
	}
	cout << endl;
	}
return 0;
}