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

#define NMAX 1111

char s[NMAX];
int N, i;

int main() {
	scanf("%s", s);
	N = strlen(s);
	for (i = 0; i + 4 < N; 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\n");
	return 0;
}