using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

     public static int? LengthOfTheShortestWord(IEnumerable<string> words)

     {

         return words.Any() ? words.Min(word => word.Length) : null;

     }

}