#include<bits/stdc++.h>
#include <atcoder/all>
#define ll long long int
#define vec vector<ll>
#define mat vector<vector<ll>>
#define pll pair<ll,ll>
#define count __builtin_popcountll

using namespace std;
using namespace atcoder;
//using mint = modint1000000007;

const ll mod=1000000007;//998244353;
const ll inf=1000000000000000000;
ll dx4[4]={1,0,-1,0};
ll dy4[4]={0,-1,0,1};
ll dx8[8]={1,0,-1,1,-1,1,0,-1};
ll dy8[8]={1,1,1,0,0,-1,-1,-1};

int main(){
  cout << fixed << setprecision(15);

  ll m;
  cin >> m;
  string s=to_string(m);
  if(s.size()==2)cout << "Yes" << endl;
  else cout << "No" << endl;

  return 0;
}