#include <iostream>
#include <cstring>


using namespace std;

char s[150];

int i, lg, k;

int main() {
    cin.get(s, 150);

    lg = strlen(s);

    for(i = 0;i < lg;i++) {
        if('A' <= s[i] && s[i] <= 'Z') s[i] += 32;
    }

    for(i = 0;i + 4 < lg;i++) {
        if(s[i] == 'y' && s[i + 1] == 'a' && s[i + 2] == 'r' && s[i + 3] == 'd' && s[i + 4] == 'i') {
            k = 1;
            break;
        }
    }

    if(k == 1) cout << "YES\n";
    else cout << "NO\n";

    return 0;
}