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;
 
class Main {
    public static void main(String[] args) {
        Scanner kb = new Scanner( System.in);   
         
        while( true ) {
            int H = kb.nextInt();
            int W = kb.nextInt();
             
            if( 0==W && 0==H ) { break; }
             
            for( int i=0; i<H; i++ ) {
                for( int j=0; j<W; j++ ) {
                    if( 0==i || H-1==i || 0==j || W-1==j ) {
                        System.out.print( "#" );
                    } else {
                        System.out.print( "." );
                    }
                }
                System.out.print( "\n" );
            }
            System.out.print( "\n" );
        }
    }
}