// Itp1_5_b.java
import java.io.*;
import java.lang.Integer;
public class Main 
{
	public static void main(String[] args) {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
loop:		while(true) {
				String in  = br.readLine() ;
				String[] hw = in.split(" ");
				int height = Integer.parseInt(hw[0]);
				int width  = Integer.parseInt(hw[1]);
				if ( height == 0 || width == 0 ) {
					break;
				}
				for( int i = 1 ; i <= height ; i++ ) {
					for( int j = 1 ; j <= width ; j++ ) {
						if ( i == 1 || i == height ) {
							System.out.print("#");
						} else {
							if ( j == 1 || j == width ) {
								System.out.print("#");
							} else {
								System.out.print(".");
							}
						}
					}
					System.out.println("");
				}
				System.out.println("");
			}
		} catch ( IOException e ) {
			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