#include <iostream>
#include <string.h>
using namespace std;

int main()
{
    char s[101];
    cin >> s;

    for(int i=0;i<strlen(s)-4;i++)
    if(s[i] == 'Y' && s[i+1] == 'a' && s[i+2] == 'r' && s[i+3] == 'd'&&s[i+4]=='i') {cout << "YES";return 0;}
    cout << "NO";
    return 0;
}