using System.Globalization;

public class Program
{
    public static void Main()
    {
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        string moji = "";

        for (int i = 0; i < int.Parse(str[0]); i++)
        {
            string st = Console.ReadLine() ?? string.Empty;
            moji += st;
        }
        if (moji.Contains("LOVE"))
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    }
}