using System;
using System.Threading;
public class Program
{
public static void Main()
Thread YY = new Thread (WriteY);
Thread XX = new Thread (WriteX);
XX.Start();
YY.Start();
}
static void WriteX()
for (int i = 0; i < 10000; i++) Console.Write ("X");
static void WriteY()
for (int i = 0; i < 10000; i++) Console.Write ("Y");