#include <cstring>
#include <iostream>
#include <algorithm>
#include <string>

using namespace std;

string A;

int main()
{
	cin.sync_with_stdio(false);
	
	string B = "Yardi";
	
	cin >> A;
	
	bool ok = false;
	for (int i = 0; i < int(A.size()); ++i)
		if (A.substr(i, 5) == B)
			ok = true;
	
	if (ok) cout << "YES\n";
	else    cout << "NO\n";
}