#include <bits/stdc++.h>
#define ll long long int
#define INF 1000000000000000000
using namespace std;

int main(void){
  ll n;
  cin >> n;
  
  if (10 <= n && n < 100)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  

  return 0;
}