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.Scanner;

public class Main {

    public static void main(String[] args) throws Exception {
        Scanner input = new Scanner(System.in);
        StringBuilder build = new StringBuilder();
        while(true){
            int h = input.nextInt();
            int w = input.nextInt();
            if(h==0&&w==0){
                break;
            }
            for(int n = 0; n < h; n++){
                for(int i = 0; i < w; i++){
                    if((n == 0 || n == h-1)||(i==0 || i==w-1)){
                    build.append("#");
                    }else{
                    build.append(".");
                    }
                }
                build.append("\n");
            }
             build.append("\n");
        }
        System.out.print(build);
    }
}