using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;

public class Test
{
    

	public static void Main()
	{
            int[] numbers = { 5, 2, 1, 5 };
            string[] words = { "flibble", "bobble", "double", "dumble" };

            IEnumerable<string> result = numbers
                .Select((len, i) => {
                    string word = words.ElementAtOrDefault(i);
                    if (word != null)
                    {
                        word = word.Length >= len ? word.Substring(0, len) : word;
                    }
                    return word;
                });
            Console.Write(String.Join(",",result.ToArray()));
	}
}