using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
            String[] A = new String[] { "one", "two", "three", "four" };
            int[] idxs = new int[] { 1, 3 };
            var result = idxs.Select(i => A[i]).ToArray();
            
            foreach(var s in result)
            Console.WriteLine(s);
	}
}