#include <bits/stdc++.h>
using namespace std;


int main() {
long long int a,b,c,d;
cin >> a >> b >> c >> d;
int D=b*b-4*a*c;

if(D<0){
    cout << "No" << endl;
}
if(D==0){
    cout << "Yes" << endl;
}

if(D>0){
    cout << (a+c)/2.0 << " " << (b+d)/2.0 << endl;
}
    
}