#include <cstdio>
#include <cstring>
using namespace std;

char s[101];

int main(){

scanf("%s", s);
int l = strlen(s);

if(l < 5){
    printf("NO");
    return 0;
}

for(int i = 0; i <= l - 5; i++){
    if(s[i]=='Y'&&s[i+1]=='a'&&s[i+2]=='r'&&s[i+3]=='d'&&s[i+4]=='i'){
        printf("YES");
        return 0;
    }
}printf("NO");

return 0;
}