using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string[] Array1 = {"collection", "sample", "dual", "map"};

        string[] Array2 = {"sample","value"};

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

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

        foreach(var val in Array1){     

            foreach(var val1 in Array2)

            {

                if(val1==val){

                DuplicateArr.Add(val1);

                }

            }

        }

        foreach(var val2 in Array1)

        {

            foreach(var val3 in DuplicateArr.ToArray())

            {

                if(val3!=val2){

                DuplicateArr.Add(val2);

                }

            }

        }

        Console.WriteLine("Duplicate data");

        foreach(var v in DuplicateArr)

        {

        Console.WriteLine(v);

        }

        Console.WriteLine("Unique data");

        foreach(var u in UniqueArr.Distinct())

        {

        Console.WriteLine(u);

        }

    }

}