#include<bits/stdc++.h>
using namespace std;

int main(){
    int n,m;
    string in;
    cin >> n >> m;
    while(cin >> in){
        if(in.find("LOVE")!=string::npos){
            cout << "YES" << endl;
            return 0;
        }
    }
    cout << "NO" << endl;
    return 0;
}