#pragma GCC optimize("O3", "unroll-loops")

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double

int main(void){
    ll a, b, c, d;
    cin >> a >> b >> c >> d;
    ll D = (a - c) * (a - c) - 8 * (b - d);
    if (D < 0) cout << "No" << endl;
    else if (D == 0) cout << "Yes" << endl;
    else{
        ld p = (a + c) / 2.0L;
        ld q = (b + d) / 2.0L;
        cout << setprecision(15) << p << " " << q << endl;
    }
    return 0;
}