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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Main {
 
    public static final int BIG_NUM  = 2000000000;
    public static final int MOD  = 1000000007;
 
    public static void main(String[] args) {
 
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 
        int H,W;
        String work[] = new String[2];
 
        while(true){
 
            try {
                work = br.readLine().split("[\\s]+");
 
                if(work[0].equals("0") && work[1].equals("0"))break;
 
                H = Integer.parseInt(work[0]);
                W = Integer.parseInt(work[1]);
 
                for(int col = 0; col < W; col++){
                    System.out.printf("#");
                }
                System.out.printf("\n");
 
                for(int row = 1; row <= H-2; row++){
                    System.out.printf("#");
                    for(int col = 1; col <= W-2; col++){
                        System.out.printf(".");
                    }
                    System.out.printf("#\n");
                }
 
                for(int col = 0; col < W; col++){
                    System.out.printf("#");
                }
                System.out.printf("\n\n");
 
 
            } catch (IOException e) {
 
                e.printStackTrace();
            }
        }
    }
}