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.text.*;

class Main {
    public static void main(String[]args)throws Exception {
        Scanner sc = new Scanner(System.in);
        for(;;) {
            int h = sc.nextInt();
            int w = sc.nextInt();
            if(h == 0 && w == 0) break;
            String s = "";
            String t = "";
            for(int i = 0; i < w; i++) {
                s += "#";
                t += (i == 0 || i == (w-1)) ? "#" : ".";
            }
            for(int i = 0; i < h; i++) {
                System.out.println((i == 0 || i == (h-1)) ? s : t);
            }
            System.out.println();
        }
    }
}