#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(ri,n) for(int ri = (int)(n-1); ri >= 0; ri--)
#define rep2(i,x,n) for(int i = (int)(x); i < (int)(n); i++)
#define repit(itr,x) for(auto itr = x.begin(); itr != x.end(); itr++)
#define rrepit(ritr,x) for(auto ritr = x.rbegin(); ritr != x.rend(); ritr++)
#define ALL(x) x.begin(), x.end()
using ll = long long;
using namespace std;

int main(){
  double  a, b, c, d;
  cin >> a >> b >> c >> d;
  double D = (c-a)*(c-a) + 8*(d-b);
  if(D < 0){
    cout << "No" << endl;
    return 0;
  }else if(D == 0){
    cout << "Yes" << endl;
    return 0;
  }
  double p = (a+c)/2;
  double q = (b+d)/2;
  printf("%.8f %.8f\n", p, q);
  // cout << fixed << setprecision(15) << p << " " << q << endl;
  return 0;
}