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) {
        Scanner input = new Scanner(System.in);
        while (true) {
            int H = input.nextInt();
            int W = input.nextInt();
            if (H == 0 && W == 0) break;
            for (int i = 1; i <= H; i++) {
                char[] cs = new char[W];
                for (int j = 1; j <= W; j++) {
                    cs[j-1] = (j == 1 || j == W || i == 1 || i == H) ? '#' : '.';
                }
                System.out.println(cs);
            }
            System.out.println();
        }
    }
}