#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    // 2x^2 + (a-c)x + (b-d) = 0
    int a,b,c,d; cin >> a >> b >> c >> d;
    int A = 2, B = a - c, C = b - d;
    int D = B * B - 4 * A * C;
    if(D > 0) {
        // 2y = (a+c)x + (b+d)
        cout << (a + c) / 2 << "." << ((a + c) % 2 == 0 ? "0" : "5") << " ";
        cout << (b + d) / 2 << "." << ((b + d) % 2 == 0 ? "0" : "5") << "\n";
    } else if(D == 0) {
        cout << "Yes" << "\n";
    } else {
        cout << "No" << "\n";
    }
}