#include <stdio.h>
#include <string.h>

char s[500];

int main ()
{
#ifndef ONLINE_JUDGE
	freopen ("regex.in", "r", stdin);
	freopen ("regex.out", "w", stdout);
#endif

	gets (s + 1);
	int i;
	for (i = 1; i <= 100; i ++)
		if (s[i] == 'Y' && s[i + 1] == 'a' && s[i + 2] == 'r' && s[i + 3] == 'd' && s[i + 4] == 'i')
		{
			printf ("YES\n");
			return 0;
		}
	printf ("NO");
	return 0;
}