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.io.*;
   
class Main{
    public static void main(String[] args) throws IOException{
 
        int x,y,i,j;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 
        while(true){
            String[] str = br.readLine().split(" ");
            x = Integer.parseInt(str[0]);
            y = Integer.parseInt(str[1]);
 
            if(x == 0 && y ==0){
                break;
            }
 
            for(i = 0; i < x; i++){
                for(j = 0; j < y; j++){
                    if(i == 0 || i+1 == x){
                        System.out.printf("#");
                    }else if(j ==0 || j+1 == y){
                        System.out.printf("#");
                    }else {
                        System.out.printf(".");
                    }
                }
                System.out.printf("\n");
            }
            System.out.printf("\n");
        }
    }
}