import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String[] str = null;
		for(;;) {
			str = br.readLine().split(" ");
			int h = Integer.parseInt(str[0]);
			int w = Integer.parseInt(str[1]);
			if(w==0&&h==0)break;
			for(int i=0;i<h;i++){
				System.out.print("#");
				for(int l=0;l<w-2;l++){
					if(i==0|i==h-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