#include<bits/stdc++.h> using namespace std; double a,b,c,d; signed main(){ cin>>a>>b>>c>>d; for(double i = -100;i <= 100;i+=0.001){ if(fabs(a*i*i*i + b*i*i + c*i + d) < 0.0001){ printf("%.2lf ",i); } } return 0; }