#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(){
  int ia, ib, ic, id;
  long double  a, b, c, d;
  cin >> ia >> ib >> ic >> id;
  if(id - ib < 0){
    cout << "No" << endl;
    return 0;
  }else if(id - ib == 0){
    cout << "Yes" << endl;
    return 0;
  }
  a = ia; b = ib; c = ic; d = id;
  long double p = (a+c)/2;
  long double q = (b+d)/2;
  cout << fixed << setprecision(15) << p << " " << q << endl;
  return 0;
}