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.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int i,j,k,x,y;
        for(i=0;;i++){
            x=sc.nextInt();
            y=sc.nextInt();
            if((x==0)&&(y==0)){
                break;
            }
            for(j=0;j<x;j++){
                if(j==0 || j==x-1){
                    for(k=0;k<y;k++){
                        System.out.print("#");
                    }
                    System.out.print("\n");
                }
                else{
                    System.out.print("#");
                    for(k=0;k<y-2;k++){
                        System.out.print(".");
                    }
                    System.out.print("#\n");
                }
            }
            System.out.print("\n");
        }
    }
}