#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int H,W;
    cin >> H >> W;
    string s;
    rep(i,0,H){
        cin >> s;
        if(s.find("LOVE") != -1){
            cout << "YES" << endl;
            return 0;
        }
    }
    cout << "NO" << endl;
}