using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<string> countys = new List<string>()

        {

            "桃園",

            "台北"

        };

        List<string> address = new List<string>()

        {

            "桃園市楊梅區",

            "台北市大安區"

        };

        foreach(var addr in address)

        {

            var county = countys.FirstOrDefault(c=>addr.Contains(c));

            Console.WriteLine(county);

        }

    }

}