#include <cstdio>
#include <iostream>
#include <string>


using namespace std;

string s;

int main(){

    //freopen("fis.in", "r", stdin);

    cin >> s;

    
    int res = s.find("Yardi");

    if(res >= 0)
        cout << "YES\n" ;
    else cout << "NO\n";

    return 0;
}