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 void main(String[] args) throws IOException {
    try ( BufferedReader br = new BufferedReader(new InputStreamReader(System.in)) ) {

      StringBuilder output = new StringBuilder();
      String[] lines;
      int h,w;

      while (true) {
        lines = br.readLine().split(" ");
        h = Integer.parseInt(lines[0]);
        w = Integer.parseInt(lines[1]);

        if(h==0 && w==0){ break; }

        for( int i = 1; i <= h; i++){
          for( int j = 1; j <= w; j++){
            if( i == 1 || i == h) output.append("#");
            else {
              if( j == 1 || j == w) output.append("#");
              else output.append(".");
            }
          }
          output.append("\n");
        }

        System.out.println(output);

        output.setLength(0);
      }
    }
  }
}