import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double a,b,c,d,D;
		double x1,x2,x3;
		Scanner in = new Scanner(System.in);
		while (in.hasNextDouble()){
            		a = in.nextDouble();
			b = in.nextDouble();
            		c = in.nextDouble();
            		d = in.nextDouble();
            		D=b*b-4*a*(c-d);
            		if(D>0){
            			x1=(-b-Math.sqrt(D))/(2*a);
            			x2=(-b+Math.sqrt(D))/(2*a);
            			System.out.println(x1+" "+x2+";");
            		}
            		else{
            			if(D==0){
            				x3=(-b)/(2*a);
            				System.out.println(x3+";");
            			}
            			else System.out.println("нет корней;");
            		}
            	}
	}
}