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

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

typedef long long ll;
typedef long double Lf;

int getchar_unlocked(void);
#define gc() getchar_unlocked()

int in() {  // 整数の入力
	int n = 0; int c;
	do c = gc();
	while (isspace(c));
	if (c == '-') {	c = gc();
		do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
		return -n;
	}
	do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

void pr(int n, Lf x1, Lf x2) {
	printf("%d\n", n);
	if (n == 1) printf("%.16Lf\n", x1);
	else if (n == 2) {
		if (x1 <= x2) printf("%.16Lf\n%.16Lf\n", x1, x2);
		else          printf("%.16Lf\n%.16Lf\n", x2, x1);
	}
	exit(0);
}
	
int main()
{
	int a, b, c;

	a = in(), b = in(), c = in();
	if (a == 0) {
		if (b == 0 && c == 0) pr(-1, 0, 0);
		else if (b == 0) pr(0, 0, 0);
		else pr(1, -(Lf)c/b, 0);
	} else if (c == 0) pr(2, 0, -(Lf)b/a);
	else {
		ll d = (ll)b*b - 4*(ll)a*c;
		if (d < 0) pr(0, 0, 0);
		else if (d == 0) pr(1, -(Lf)b/(2*a), 0);
		else {
			Lf x, t = sqrtl((Lf)d);
			if (b >= 0) x = (-b-t)/(2*a);
			else        x = (-b+t)/(2*a);
			pr(2, x, (Lf)c/a/x);
		}
	}
	return 0;
}