C++ :

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cstdlib>
#include<cmath>
#include<iomanip>
#include<algorithm>
using namespace std;
double a,b,c,d;
int k=0;
int main(){
	scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
	//cin>>a>>b>>c>>d;
	double x,temp;
	for(x=-100*1.0;x<=1.0*100;x=1.0*0.01+1.0*x){
		temp=1.0*(a*x*x*x+b*x*x+c*x+d);
		if(temp==0.0||(temp>=-0.001&&temp<=0.001)) {
			k++;
			printf("%.2f",x);
			if(k!=3) cout<<" ";
			else break;
		}
	}
	
	return 0;
}