class Program
{
    static void Main(string[] args)
    {
        string[] input = Console.ReadLine()!.Split(' ');
        int count = int.Parse(input[0]);
        bool judgment = false;

        for (int i = 0; i < count; i++)
        {
            string word = Console.ReadLine()!;
            if (word.Contains("LOVE"))
            {
                judgment = true;
            }
        }

        if (judgment)
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    }
}