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 r1 = new Regex("(abc)|(xyz)*");
Console.WriteLine(r1.IsMatch("abcxyzabcxyzxyzabcabcabc"));
}
}