using System;
using System.Linq;

namespace App
{
    class Program
    {
        static void Main(string[] args)
        {
            bool f = false;
            for (int i = Convert.ToInt16(Console.ReadLine()); i > -1; i--)
            {
                var a = Console.ReadLine();
                if (a.IndexOf("LOVE") >= 0)
                {
                    f = true;
                }
            }
            if (f)
            {
                Console.WriteLine("YES");
            }
            else
            {
                Console.WriteLine("NO");
            }

        }
    }
}