#include <cstdio>
#include <cstring>

using namespace std;

char a[10007];
int n;

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