#include<bits/stdc++.h>
using namespace std;
using ll=long long;
constexpr ll mod=1e9+7;

int main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  string n;
  cin>>n;
  if (n.size() == 2) cout << "Yes\n";
  else cout << "No\n";
}