#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>

using namespace std;
typedef long long ll;
ll a, b, c, d;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    cin >> a >> b >> c >> d;
    ll e = a-c;
    ll f = b-d;
    ll D = e*e-8*f;
    if(D < 0){
        cout << "No" << endl;
    }else if(D == 0){
        cout << "Yes" << endl;
    }else{
        double p = ((double)(a+c))/2.0;
        double q = ((double)(b+d))/2.0;
        cout << p << ' ' << q << endl;
    }
}