using System; using System.Collections.Generic; using System.Globalization; using System.Text; using System.Text.RegularExpressions; using System.Reflection;
public class MainClass{
public static void Main(){
Regex r2 = new Regex("((abc)|(xyz))*");
Console.WriteLine(r2.Match("abcxyzabcxyzxyzabcabcabc").Value);
}
}