#include <iostream>
using namespace std;

string s1 = "Yardi";

int main()
{
    string s;
    cin >> s;
    for(int i = 0; i <= s.size() - 5; i++){
        bool ok = true;
        for(int j = 0; j < 5; j++){
            if(s[i+j] != s1[j]) ok = false;
        }
        if(ok){
            cout << "YES";
            return 0;
        }
    }
    cout << "NO";
}