using System;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var text = "Write your letter in the sand";
		var test = Regex.Replace(text, @"^\w+\W+(\w)", x => x.Groups[1].Value.ToUpper());
        Console.WriteLine(test);
	}
}