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;

class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int H = sc.nextInt();
        int W = sc.nextInt();
        while(H!=0||W!=0){
            for(int i=0;i<H;i++){
                if(i==0||i==H-1){
                    for(int j=0;j<W;j++) System.out.print("#");
                }else{
                    for(int j=0;j<W;j++){ 
                    if(j==0||j==W-1) System.out.print("#");
                    else             System.out.print(".");
                    }
                }
                System.out.println("");
            }
            System.out.println("");
            H = sc.nextInt();
            W = sc.nextInt();
        }
    }
}