import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		StringBuilder sb = new StringBuilder();
		Scanner scan = new Scanner(System.in);
		while(true){
		//Scanner scan = new Scanner(System.in);


		int H = scan.nextInt();
	    int W = scan.nextInt();


	    if(H == 0 && W == 0)break;
	    for(int i = 1;i <= H ;i++){
	    	for(int j = 1;j <= W; j++){
	    		if((i == 1 || j == 1) || i == H || j == W){
	    			//sb.append("#");
	    			System.out.print("#");
	    		}else{
	    			//sb.append(".");
	    			System.out.print(".");
	    		}

	    	}
	    	System.out.println();
	    	//sb.append("\n");
	    }
	    //sb.append("\n");
	    System.out.println();
	   }
		//System.out.print(sb);

	}

}
/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