#include <iostream>
#include <cstring>

using namespace std;

const char SIR[] = "Yardi";

int main()
{
    char A[101];
    cin.get(A, 101);
    int l = strlen(A);
    int cnt = 0;
    bool ok = false;
    for( int i = 0; i <= l; ++i )
    {
        if( A[i] == SIR[cnt] )
        {
            if( cnt == 4 )
            {
                cout << "YES";
                ok = 1;
                break;
            }
            cnt++;
        }
        else
            cnt = 0;
    }

    if(!ok)
        cout << "NO";

    return 0;
}