import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(true){
            int h = sc.nextInt();
            int w = sc.nextInt();
            if(h == 0 && w == 0){
                break;
            }
            
            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){
                        System.out.print('.');
                    }else{
                        System.out.print('#');
                    }
                }
                System.out.println();
            }
            System.out.println();
        }
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz