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