name= input()
c=0
if("Danil" in name):
if(name.count('Danil')==1):
c=c+1
else:
c=1000
if("Olya" in name):
if(name.count('Olya')==1):
c=c+1
else:
c=1000
if("Slava" in name):
if(name.count('Slava')==1):
c=c+1
else:
c=1000
if("Ann" in name):
if(name.count('Ann')==1):
c=c+1
else:
c=1000
if("Nikita" in name):
if(name.count('Nikita')==1):
c=c+1
else:
c=1000
if(c==1):
print("YES")
else:
print("NO")#include<bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
string names[5] = { "Danil", "Olya", "Slava", "Ann", "Nikita" };
string s;
cin >> s;
int max = 0;
for(int i = 0; i < s.size(); i++) {
for(int j = 0; j < 5; j++) {
string sbstr = s.substr(i, names[j].size());
if(sbstr == names[j]) {
max++;
}
}
}
if(max == 1) {
cout << "YES";
} else cout << "NO";
return 0;
}
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