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);
        int H,W;
        while(sc.hasNextLine()){
            String[] str = sc.nextLine().split(" ");
            H = Integer.parseInt(str[0]);
            W = Integer.parseInt(str[1]);
            if(H == 0 && W == 0) break;
            for(int y = 0; y < H; y++){
                for(int x = 0;x < W; x++){
                    if(y == 0 || y == H-1 ||
                       x == 0 || x == W-1) System.out.print("#");
                    else System.out.print(".");
                }
                System.out.println();
            }
            System.out.println();
        }
    }
 
}