#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  double a, b, c, d;
  cin >> a >> b >> c >> d;
  double ans1 = (a + c) / 2, ans2 = (b + d) / 2;
  double x = (a - c) / 2, y = (b - d) / 2;
  double dd = x * x - 4 * y;

  if (dd == 0)
    cout << "Yes" << endl;
  else if (dd < 0)
    cout << "No" << endl;
  else
    cout << fixed << setprecision(10) << ans1 << " " << ans2 << endl;
}