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.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        
        while(true){
            int height = sc.nextInt();
            int weight = sc.nextInt();
            
            if( height == 0 && weight == 0 ) break;
            for(int h = 0; h < height; h++){
                for(int w = 0; w < weight; w++){
                    if( h == 0 || h == height-1 || w == 0 || w == weight-1){
                        System.out.print("#");    
                    }else{
                        System.out.print(".");
                    }
                }
                System.out.println();
            }
            System.out.println();
        }
    }
}