#include <bits/stdc++.h>

using namespace std;

string c;
int ok=0;

int main()
{
    getline(cin,c);
    for(int i=0;i<c.size()-5;i++){
        if(c[i] == 'Y' && c[i+1] == 'a' && c[i+2] == 'r' && c[i+3] == 'd' && c[i+4] == 'i')
            ok=1;
    }
    if(ok == 1)
        cout<<"YES";
    else
        cout<<"NO";
    return 0;
}