Problem:
Print a Frame

Draw a frame which has a height of H cm and a width of W cm. For example, the following figure shows a frame which has a height of 6 cm and a width of 10 cm.

##########
#........#
#........#
#........#
#........#
##########

Input

The input consists of multiple datasets. Each dataset consists of two integers H and W separated by a single space.

The input ends with two 0 (when both H and W are zero).

Output

For each dataset, print the frame made of '#' and '.'.

Print a blank line after each dataset.

Constraints

3 ≤ H ≤ 300

3 ≤ W ≤ 300

Sample Input

3 4
5 6
3 3
0 0

Sample Output

####
#..#
####

######
#....#
#....#
#....#
######

###
#.#
###

Solution in JAVA (judge verdict: Accepted)

import java.util.*;
import java.io.*;

public class Main{
    public static void main(String args[]){
        Scanner in = new Scanner(System.in);
        
        PrintWriter out = new PrintWriter(System.out);
        while(true){
            int height = Integer.parseInt(in.next()), width = Integer.parseInt(in.next());
            
            if(height == 0 && width == 0) break;

            draw_rect(height, width, out);
        }

        out.flush();
    }

    static void draw_rect(int height, int width, PrintWriter out){
        for(int i = 0; i < height; i++){
            for(int j = 0; j < width; j++){
                if(i == 0 || i == height - 1 || j == 0 || j == width -1){
                    out.print("#");
                }
                else out.print(".");
            }
            out.println();
        }
        out.println();
    }
}