import strutils, sequtils, algorithm, future, math

{.warning[SmallLshouldNotBeUsed]: off.}

converter toChar(x: int): char = chr(x)
converter toInt(x: char): int = ord(x)

when isMainModule:
  var
    input = stdin.readline.split.map(parseint)
    n = input[0]
  for _ in 0..<n:
    if find(stdin.readline, "LOVE") >= 0:
      echo("YES")
      quit()
  echo("NO")