// yuki 955 ax^2+bx+c=0
// 2019.12.18 bal4u

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

typedef long long ll;

int main()
{
	int a, b, c;
	ll d;
	double x1, x2;

	scanf("%d%d%d", &a, &b, &c);
	if (a == 0 && b == 0 && c == 0) { puts("-1"); return 0; }
	if (a == 0 && b == 0) { puts("0"); return 0; }
	if (a == 0) {
		puts("1");
		printf("%.16lf\n", -(double)c/b);
	} else {
		d = (ll)b*b - 4*(ll)a*c;
		if (d < 0) puts("0");
		else if (d == 0) {
			puts("1");
			printf("%.16lf\n", -(double)b/(2*a));
		} else {
			double t = sqrt((double)d);
			puts("2");
			x1 = (-b-t)/(2*a), x2 = (-b+t)/(2*a);
			if (x1 <= x2) printf("%.16lf\n%.16lf\n", x1, x2);
			else printf("%.16lf\n%.16lf\n", x2, x1);
		}
	}
	return 0;
}