#include <iostream>
#define FOR(i,x,y) for(int i=x;i<y;i++)
using namespace std;
int main(){
    int n,m;
    char c;
    string s;
    cin>>n>>m;
    
    FOR(i,0,4){
        cin>>c;
        s+=c;
    }
    
    FOR(i,0,n*m-4){
        if(s=="LOVE"){
            cout<<"YES";
            exit(0);
        }
        cin>>c;
        s=s.substr(1,3)+c;
    }
    cout<<"NO"<<endl;
    
}