#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
#include <iomanip>
using namespace std;

typedef long long ll;

#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(ll i=(a);i<(b);++i)
#define per(i,a,b) for(ll i=(b-1);i>=(a);--i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
#define ctos(c) string(1,c)
#define print(x) cout<<#x<<" = "<<x<<endl;

#define MOD 1000000007

int main() {
  ll h,w;
  cin>>h>>w;
  if(w<4){
    cout << "NO" << endl;
    return 0;
  }
  string s1 = "LOVE";
  ll flag = 0;
  rep(y,0,h){
    string s;
    cin>>s;
    rep(i,0,s.sz-3){
      ll flag1 = 1;
      rep(j,0,4){
        if(s[i+j]!=s1[j]){
          flag1 = 0;
        }
      }
      if(flag1 == 1){
        flag = 1;
      }
    }
  }
  if(flag==1){
      cout << "YES" << endl;
  }
  else{
      cout << "NO" << endl;
  }
  return 0;
}