//Joelito B. Namoc

//Muelver Octavio

using System;

public class Program

{

    public static void Main() 

    { 

        Console.Write("Enter Symbol: ");

   String num = Convert.ToString( Console.ReadLine() );

   Console.Write("Enter height: ");

   int height = Convert.ToInt32( Console.ReadLine() );

        Console.Write("Enter width: ");

   int width = Convert.ToInt32( Console.ReadLine() );

        HollowSquare(num, height, width); 

    } 

     static void HollowSquare(String num, int n, int m) 

    { 

        int i, j; 

        for (i = 1; i <= n; i++) 

        { 

            for (j = 1; j <= m; j++) 

            { 

                if (i == 1 || i == n ||  

                    j == 1 || j == m)

                  Console.Write("{0}",num);  

                else 

                    Console.Write(" ");          

            } 

                  Console.WriteLine(); 

        }  

    }    

} 

​