#include <atcoder/all>
#include <iostream>
#include <vector>
#include <map>
using namespace atcoder;
using namespace std;
using ll = long long;
using ull = unsigned long long;
using mll = static_modint<998244353>;
#define rep(i,n) for(int i=0; i<(n); i++)

int main(){
  int N; cin >> N;
  if(10 <= N && N <= 99) cout << "Yes";
  else cout << "No";
  cout << endl;
  return 0;
}

struct ios_do_not_sync{
  ios_do_not_sync(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
  }
} ios_do_not_sync_inst;