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