#include <iostream>
#include <string>

void solve() {
    int n, m;
    std::cin >> n >> m;

    while (n--) {
        std::string s;
        std::cin >> s;

        if (s.find("LOVE") != std::string::npos) {
            std::cout << "YES" << std::endl;
            return;
        }
    }

    std::cout << "NO" << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}