#include <fstream>
#include <list>
#include <string>

using namespace std;

ifstream fin("componenteconexe3.in");
ofstream fout("componenteconexe3.out");

int a,b,n,ans,b;
list <int>G[110];
string s;

int main()
{
    cin>>s;
    if( s.find( "Yardi" , string::npos + 1 ) != string::npos )
        cout<<"YES";
    else
        cout<<"NO";

return 0;
}