تفریق(Subtraction)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Subtraction
{
    class Program
    {
        static void Main(string[] args)
        {
            string a;
            string b;
            Console.WriteLine("a&b:");
            a = Console.ReadLine();
            b = Console.ReadLine();
            int a1 = Int32.Parse(a);
            int b1 = Int32.Parse(b);
            int c = a1 - b1;
            Console.WriteLine("Result:" + c.ToString());
            Console.ReadKey();

        }
    }
}