import java.io.*;
  
class Main{
	public static void main(String[] args) throws IOException{

		int x,y,i,j;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while(true){
			String[] str = br.readLine().split(" ");
			x = Integer.parseInt(str[0]);
			y = Integer.parseInt(str[1]);

			if(x == 0 && y ==0){
				break;
			}

			for(i = 0; i < x; i++){
				for(j = 0; j < y; j++){
					if(i == 0 || i+1 == x){
						System.out.printf("#");
					}else if(j ==0 || j+1 == y){
						System.out.printf("#");
					}else {
						System.out.printf(".");
					}
				}
				System.out.printf("\n");
			}
			System.out.printf("\n");
		}
  	}
}
/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