#[allow(non_snake_case)]

fn main() {
  use std::io::{Read, Write, BufWriter};
  let mut a = Vec::new();
  std::io::stdin().read_to_end(&mut a).unwrap();
  let a = String::from_utf8(a).unwrap();
  let mut a = a.split_whitespace();
  let mut b = BufWriter::new(std::io::stdout());
  macro_rules! yomu { ($t:ty) => (a.next().unwrap().parse::<$t>().unwrap()) }
  macro_rules! kaku { ($($arg:tt)*) => (writeln!(b, $($arg)*).unwrap()) }
  
  let N = yomu!(usize);
  let M = yomu!(usize);
  let S: Vec<Vec<u8>> = (0..N).map(|_| yomu!(String).as_bytes().to_vec()).collect();
  let f = || {
    for i in 0..N {
      for j in 0..M-3 {
        if &S[i][j..j+4] == b"LOVE" {
          return true
        }
      }
    }
    false
  };
  kaku!("{}", if f() { "YES" } else { "NO" })
}