#include<bits/stdc++.h>
using namespace std;
double a,b,c,d;
int main()
{
	cin >>a>>b>>c>>d;
	for (double i=-100;i<=100;i+=0.001)
	{
		if (abs(a*i*i*i+b*i*i+c*i+d)<0.001)
			printf("%.2lf ",i);
	}
	return 0;
}

为什么绝对值要小于0.001