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: Wrong Answer)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
  
public class Main {
    public static void main(String[] args) throws IOException {
        int xLine = 0;
        int yLine = 0;
        Boolean flg = true;
        
        BufferedReader br =
        		new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb =
        		new StringBuilder();
        
        
        while(flg){
            String str[] = br.readLine().split(" ");
            yLine = Integer.parseInt(str[0]);
            xLine = Integer.parseInt(str[1]);
            
        	if(xLine==0 && yLine==0) {
        		flg = false;
        	}
        	else {

        		for(int i=0; i<yLine; i++){
        			for(int j=0; j<yLine; j++){
                    	if(j>=1 && j<yLine-1 && i>=1 && i<xLine-1)
                    		sb.append(".");
                    	else
                    		sb.append("#");
                    }
                    sb.append("\n");
                }
                sb.append("\n");
            }
        }
        System.out.print(sb);
    }
}