#include <bits/stdc++.h>
using namespace std;

#define fs(n) fixed << setprecision(n);
#define mp(a, b) make_pair(a, b);
using ll = long long;
using ld = long double;

int main(){
  int n; cin >> n;
  if(n >= 10 && n <= 99) cout << "Yes" << endl;
  else cout << "No" << endl;
}