using System;

using System.Linq;

using System.Collections.Generic;

using System.Text;                  

public class Program

{

    public static void Main()

    {

        StringBuilder sb = new StringBuilder();

        string left = "Hello";

        string right = "1998"+ Environment.NewLine +"1999"+ Environment.NewLine +"2000";

        var concatString = right.Split(new[] { Environment.NewLine }, StringSplitOptions.None).Select(x => left + x);

        string result = string.Join(Environment.NewLine , concatString);

        Console.WriteLine(result);

    }

}