public static void Main()
Console.WriteLine("enter something");
ch1 = char.Parse(Console.ReadLine());
Console.WriteLine("enter something");
ch2 = char.Parse(Console.ReadLine());
Console.WriteLine( (num3*10+num4) + (num4*10+3));
Console.WriteLine(num3*10 +num4);
Console.Write(num4*10 +num3);