using System;
using System.Text.RegularExpressions;

public class Solution
{
	public static void Main(String[] args)
	{
		string input = "where dog is and cats are and bird is bigger than a mouse";
      	string pattern = "(?:where|and)";  
		string[] substrings = Regex.Split(input, pattern);
      	foreach (string match in substrings)
      	{
        	 Console.WriteLine("'{0}'", match);
      	}
	}
}