using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var str = "Please write a program that breaks this text into small chucks. Each chunk should have a maximum length of 25 ";
		var chunks = Regex.Matches(str, @"(\b.{1,25})(?:\s+|$)")
		         .Cast<Match>().Select(p => p.Groups[1].Value)
		         .ToList();
		Console.WriteLine(string.Join("\n", chunks));
	}
}

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