using System;

public class Program

{

    public static void Main()

    {

        int a,b,c;

        Console.WriteLine("Enter the letter a");

        a = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter the letter b");

        b = Convert.ToInt32(Console.ReadLine());

        c = a-b;

        Console.WriteLine ("The result is "+c);

    }

}