#include<iostream>
#include<fstream>
#include<algorithm>
#include<cstring>
#include<vector>
#include<string>
#include<queue>
#define in cin
#define out cout
#define abs(x) ((x>0)?(x):(-(x)))
#define max(a, b) (a > b ? a : b)
#define min(a, b) (a < b ? a : b)
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define DOWNFOR(i, a, b) for(int i = a; i >= b; --i)
#define FOREACH(i, t) for (typeof(t.begin()) i = t.begin(); i != t.end(); ++i)
#define ll long long
using namespace std;
int main(){
    #ifndef ONLINE_JUDGE
    ifstream in("test.in");
    ofstream out("test.out");
    #endif
    string s;
    in>>s;
    int w=0;
    int ok=0;
    for(int i=0;i<s.length();i++){
        if(s[i]=='Y') w=1;
        else if(s[i]=='a'){
            if(w==1) w=2;
            else w=0;
        }
        else if(s[i]=='r'){
            if(w==2) w=3;
            else w=0;
        }
        else if(s[i]=='d'){
            if(w==3) w=4;
            else w=0;
        }
        else if(s[i]=='i'){
            if(w==4) ok=1;
            else w=0;
        }
        else w=0;
    }
    if(ok) out<<"YES\n";
    else out<<"NO\n";
    return 0;
}