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 sc = new Scanner(System.in);
        ArrayList<Integer> A = new ArrayList<Integer>();

        for (;;) {
            int H = sc.nextInt();
            int W = sc.nextInt();
            if (H == 0 && W == 0) {
                for (int i=0; i<A.size(); i=i+2) {
                    for (int j=0; j<A.get(i); j++) {
                        for (int k=0; k<A.get(i+1); k++) {
                            if (j == 0 || j == A.get(i)-1) {
                                System.out.print("#");
                            }
                            else if (k == 0 || k == A.get(i+1)-1) {
                                System.out.print("#");
                            }
                            else {
                                System.out.print(".");
                            }
                        }
                        System.out.println();
                    }
                    System.out.println();
                }
                break;
            }
            else {
                A.add(H);
                A.add(W);
            }
        }

    }
}