import scala.io.StdIn.readLine

object Main {
  def main(args: Array[String]){
    val cnt = readLine().split(" ").head.toInt
    val ret = (1 to cnt).filter {_ =>
        val s = readLine()
        s.indexOf("LOVE") >= 0
    }.nonEmpty
    if (ret) 
      println("YES")
    else
      println("NO")
  }
}