#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream> 
#include <climits>

using namespace std;

int n;

int main()
{
    string s;
    getline(cin, s);
    size_t found = s.find("Yardi");
    if (found != std::string::npos)
    {
      cout << "YES";
    }
    else 
    {
      cout << "NO";
    }

  
  return 0;
}