include
include
include
using namespace std;
int main() {
string name; getline (cin,name); string d = "Danil"; string s = "Slava"; string o = "Olya"; string a = "Ann"; string n = "Nikita"; if(name == "Danil" || name == "Slava" || name == "Olya" || name == "Ann" || name == "Nikita" ) { cout<<"YES"; return 0; } int array[10] = {-1}; array[0] = name.find(d); if(array[0] != -1){ name.replace(array[0], 5, "_"); } array[1] = name.find(d); array[2] = name.find(s); if(array[2] != -1){ name.replace(array[2], 5, "_"); } array[3] = name.find(s); array[4] = name.find(o); if(array[4] != -1){ name.replace(array[4], 4, "_"); } array[5] = name.find(o); array[6] = name.find(a); if(array[6] != -1){ name.replace(array[6], 3, "_"); } array[7] = name.find(a); array[8] = name.find(n); if(array[8] != -1){ name.replace(array[8], 6, "_"); } array[9] = name.find(n); int sum; int y = 0; for(int i = 0; i<10; i++) { sum += array[i]; if(array[i] != -1) { y++; } } if(sum == -10){ cout<<"NO"; return 0; } else if(y == 1 && sum!= -10) { cout<<"YES"; return 0; } else if(y > 1) { cout<<"NO"; return 0; } return 0;
}