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.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a,b;
        while(true){
            a=sc.nextInt();b=sc.nextInt();
            if(a==0 && b==0)break;
            for(int i=0;i<a;i++){
                if(i==0 || i==a-1){
                for(int j=0;j<b;j++){
                    System.out.print("#");
                }
                System.out.println();continue;
                }
                for(int j=0;j<b;j++){
                    if(j==0 || j==b-1)System.out.print("#");
                    else System.out.print(".");
                }
                System.out.println();
            }
            System.out.println();
        }
    }
}