#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    long long a, b, c, d;
    cin >> a >> b >> c >> d;
    long long A = 2, B = a - c, C = b - d;
    if (B * B - 4 * A * C < 0)
    {
        cout << "No" << '\n';
        return 0;
    }
    if (B * B - 4 * A * C == 0)
    {
        cout << "Yes" << '\n';
        return 0;
    }
    cout << fixed << setprecision(17) << 1.0 * (a + c) / 2 << " " << 1.0 * (b + d) / 2 << '\n';
    return 0;
}