#include <iostream>
using namespace std;

int main()
{
    int i = 0;
    char x[100];
    int state = 0;
    cin >> x;
    while((i < 100) && (state < 5)) {
            if(x[i] == 0)
                i = 100;
            else {
                switch(x[i]) {
                case 'Y' : state = 1; break;
                case 'a' : state = state == 1 ? 2 : 0; break;
                case 'r' : state = state == 2 ? 3 : 0; break;
                case 'd' : state = state == 3 ? 4 : 0; break;
                case 'i' : state = state == 4 ? 5 : 0; break;
                default  : state = 0;
                }
                i++;
            }
    }
    if(state == 5)
        cout << "YES";
    else
        cout << "NO";
    return 0;
}