#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int h, w;
    cin >> h >> w;
    string s, t = "LOVE";

    bool flag = false;
    rep(i, h) {
        int cnt = 0;
        cin >> s;
        rep(j, s.size()) {
            if (s[j] == t[cnt])
                ++cnt;
            if (cnt == 4)
                break;
        }
        if (cnt == 4)
            flag = true;
    }

    flag ? cout << "YES" : cout << "NO";
    cout << endl;

    return 0;
}