#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(void) {
    long a, b, c;
    double s1, s2;
    scanf("%ld%ld%ld", &a, &b, &c);
    if (a == 0) {
        if (b == 0) {
            if (c == 0) {
                printf("-1\n");
                return EXIT_SUCCESS;
            }
            printf("0\n");
            return EXIT_SUCCESS;
        }
        s1 = (double)-c/b;
        printf("1\n%.15lf\n", s1);
        return EXIT_SUCCESS;
    }
    long long D = (long long)b*b - (long long)4*a*c;
    if (D > 0) {
        s1 = (double)-b/(2*a) - sqrt(D)/(2*a);
        s2 = (double)-b/(2*a) + sqrt(D)/(2*a);
        printf("2\n%.15lf\n%.15lf\n", s1, s2);
    } else if (D == 0) {
        s1 = (double)-b/(2*a);
        printf("1\n%.15lf\n", s1);
    } else {
        printf("0\n");
    }

    return EXIT_SUCCESS;
}