using System;

using System.Linq;

public class Program

{

    public static string Filter(string input, params string[] items)

{

    var filtered = input.Split('|').Where(x => items.Contains(x.Split(':')[0].Trim()));

    return string.Join("|", filtered); 

}

    public static void Main()

    {

    string text = "Score: 100 | Speed: 50";

        Console.WriteLine(Filter(text, "Score", "Speed"));

        Console.WriteLine(Filter(text, "Speed"));

        Console.WriteLine(Filter(text, "Score"));

    }

}