using System;

public class Program

{

    public static void Main()

    {

        double a,b,c,d,x,x1,x2;

        a=double.Parse(Console.ReadLine());

        b=double.Parse(Console.ReadLine());

        c=double.Parse(Console.ReadLine());

        d=double.Parse(Console.ReadLine());

        x=double.Parse(Console.ReadLine());

​

        if(a==0)

        {

            if(b==0)

            {

                if(c==0)

                    Console.WriteLine("all real number");

                else

                    Console.WriteLine("no solutions");

            }

            else

                x=-c/b;

            Console.WriteLine(x);

        }

        else

            d=(d*d)-(4*a*c);

        Console.WriteLine(d);

        if(d==0)

        {

            x=-b/2*a;

            Console.WriteLine(x);

            if(d>0)

            {

                x1=(-b+Math.Sqrt(d)/2*a);

                x2=(-b-Math.Sqrt(d)/2*a);

                Console.WriteLine(x1);

                Console.WriteLine(x2);

                    else

                    Console.WriteLine("no solutions");

            }

​

        }

​

    }

}