#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using PII = pair<int, int>;
using VI = vector<int>;

int main() {
#ifdef LOCAL_EXEC
//	freopen("sample.in", "r", stdin);
//	freopen("sample.out", "w", stdout);
#else
  ios_base::sync_with_stdio(false); cin.tie(NULL);
#endif

  string s; cin >> s;
  if (s[2] == s[3] && s[4] == s[5]) cout << "Yes\n";
  else cout << "No\n";

  return 0;
}
