#include<bits/stdc++.h>
using namespace std;
double l,m,n,h;
int a,b,c,d;
int main() {
	cin>>a>>b>>c>>d;
	for(double i=-100.00000;!(i>99.999);i+=0.00001){
		if(a*i*i*i+b*i*i+c*i+d>=-0.001&&a*i*i*i+b*i*i+c*i+d+0.001<=0.001){
			printf("%.2lf ",i);
			i+=0.001;
		}
	}
}