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 C# (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
public class Hello{
    public Hello(){}
    public static void Main(){
        new Hello().Calc();
    }
    void Calc(){
        var inputs = InputValue;
        foreach(var i in inputs){
            Console.WriteLine(i);
        }
    }
    string MakeRectangle(int h,int w){
        var temp = "";
        for(var y = 0;y < h;y++){
            for(var x = 0;x < w;x++){
                if((y == 0 || y == h - 1) || (x == 0 || x == w - 1)){
                    temp += "#";
                }else{
                    temp += ".";
                }
            }
            temp += "\n";
        }
        return temp;
    }
    List<string> InputValue{
        get{
            var inputs = new List<string>();
            
            while(true){
                var line = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
                if(line[0] == 0 && line[1] == 0){
                    break;
                }else{
                    inputs.Add(MakeRectangle(line[0],line[1]));
                }
                
            }
            return inputs;
        }
    }
}