import java.util.Scanner;
import java.util.Locale;

public class SecondDegreeEquationv2 {

    static void sde(int a, int b, int c) {

        if (a==0) {
            if (b==0) {
                if (c==0) {
                    System.out.println("infinite solutions");
                }
                else {
                    System.out.println("undetermined");
                }
            }
            else {
                double x = (-c*1.0)/(b);

                System.out.printf("%d %d %d %.4f first degree equation\n", a, b, c, x);
            }

        }
        else {
            if (b*b >= 4*a*c) {
                if (b*b == 4*a*c) {
                    double x = (-b)/(2.0*a);

                    System.out.printf("%.4f double solution\n", x);
                }
                else {
                    double x1 = (-b+Math.sqrt(b*b-4.0*a*c))/(2.0*a);
                    double x2 = (-b-Math.sqrt(b*b-4.0*a*c))/(2.0*a);

                    System.out.printf("%.4f and %.4f\n", x1, x2);
                }
            }
            else {
                double real = (-b)/(2.0*a);
                double im = Math.abs(Math.sqrt(4.0*a*c-b*b)/(2.0*a));

                System.out.printf("%.4f + %.4fi and %.4f - %.4fi\n", real, im, real, im);
            }


        }


    }

    public static void main(String[] args) {

        Scanner kbd = new Scanner( System.in ).useLocale( Locale.US );

        while (kbd.hasNext()) {

            int a = kbd.nextInt();
            int b = kbd.nextInt();
            int c = kbd.nextInt();

            sde(a, b, c);

        }

    }

}