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);
        while(true){
            int n = sc.nextInt();
            int m = sc.nextInt();
            if(n == 0 && m == 0){
                break;
            }else{
                for(int i = 0; i < n; i++){
                    if(i == 0 || i == n - 1){
                        for(int j = 0; j < m; j++){
                            System.out.print("#");
                        }
                        System.out.println("");
                    }else{
                        for(int j = 0; j < m; j++){
                            if(j == 0 || j == m - 1){
                                System.out.print("#");
                            }else{
                                System.out.print(".");
                            }
                        }
                        System.out.println("");
                    }
                }
                
            }
            System.out.println();
            
        }
    }
}