#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); i ++)
using namespace std;
typedef long long ll;
typedef pair<ll,ll> PL;
typedef pair<int,int> P;
const int INF = 1e9;
const ll MOD = 1e9 + 7;

int main() {
    ll A,B,C,d; cin >> A >> B >> C >> d;
    ll D = (C - A)*(C - A) - 8*(B - d);
    if (D > 0) {cout << (double)(A + C)/2 << ' ' << (double)(B + d)/2 << endl;}
    else if (D == 0) {cout << "Yes" << endl;}
    else cout << "No" << endl;
}