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 Exception {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb=new StringBuilder();
		while(true){
			String[] ary=br.readLine().split(" ");
			int H=Integer.parseInt(ary[0]);
	        int W=Integer.parseInt(ary[1]);
			if(H==0&&W==0) break;
			for(int i=0;i<H;i++){
				for(int j=0;j<W;j++){
					if(i!=0&&i!=H-1&&j!=0&&j!=W-1){
						sb.append('.');
					}else{
						sb.append('#');
					}
				}
				sb.append('\n');
			}
			sb.append('\n');
		}
		System.out.print(sb);
	}
}