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

int main(){
  int a,b,c,d;
  cin>>a>>b>>c>>d;
  if((a-c)*(a-c)-4*(b-d)<0){
    cout<<"No"<<endl;
    return 0;
  }
  if((a-c)*(a-c)-4*(b-d)==0){
    cout<<"Yes"<<endl;
    return 0;
  }
  double x=a+c;
  double y=b+d;
  cout<<fixed<<setprecision(10);
  cout<<x/2<<" "<<y/2<<endl;
}