Count the length of last word in a String

Suppose you have a string "I love Programming"
Output - should be  11.
if there is no word then Output: 0

static void Main1(string[] args)

        {

            string s = Console.ReadLine();

            string[] arr = s.Split(' ');

            int length = arr.Length;

            Console.WriteLine(arr[length - 1].Length);

            Console.ReadLine();

        }