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

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

typedef long long ll;

#define ZERO(x)  (fabsl(x)<=1e-16)

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

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