using System;
using System.Linq;
using System.Collections.Generic;
public class Program
{
public static void Main(string[] args)
{
List<string> lst = new List<string> { "python", "c", "c++", "c#", "java", "php", "nodejs", "ada" };
List<string> threeLetter_words = lst.Where(word => word.Length == 3).ToList();
Console.WriteLine(string.Join(", ", threeLetter_words));
}
}
/*
run:
c++, php, ada
*/