using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        List<string> lst = new List<string>();

        lst.Add("AAbbZ");

        lst.Add("CCZDD");

        foreach(string str in lst.Where(a=>a.Contains("z"))) {

            Console.WriteLine(str);

        }

        int d;

        d=1000;

        Console.WriteLine(d.ToString("N",new System.Globalization.CultureInfo("id-ID")));

    }

    public static string Reverse(string s)

        {

            char[] charArray = s.ToCharArray();

            Array.Reverse(charArray);

            return new string(charArray);

        }

}

​

​