<?php
$count = explode(" ",trim(fgets(STDIN)));
$array = array();
for ($i = 0; $i < $count[0]; $i++) {
    $array[] = trim(fgets(STDIN));
}
$ans = 0;
foreach ($array as $value){
    if (preg_match("/LOVE/", $value) >= 1) {
    $ans ++;
    }
}
echo $ans == 0 ? "NO" : "YES";