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){
        Scanner sc = new Scanner(System.in);
        while(true){
            int H = sc.nextInt();
            int W = sc.nextInt();
            if(H==0 && W ==0){
                break;
            }
            for(int i=0;i<H;i++){
                if(i==0 || i==H-1){
                    for(int j=0;j<W;j++){
                        System.out.printf("#");
                    }
                }else{
                    for(int j=0;j<W;j++){
                        if(j==0 || j==W-1){
                            System.out.printf("#");
                        }else{
                            System.out.printf(".");                
                        }
                    }
                }
                System.out.printf("\n");
            }
            System.out.printf("\n");
        }
    }
}