#include <iostream>
#include <cstring>
char s[110];
using namespace std;
int main()
{
    char * pch;
    cin.getline(s,100);
    pch=strstr(s, "Yardi");
    if(pch!=NULL)
        cout<<"YES"<<endl;
    else
        cout<<"NO"<<endl;
    return 0;
}