#include <stdio.h>
#include <math.h>
int main() {
	long long int a, b, c;
	scanf("%lld%lld%lld", &a, &b, &c);
	if (a == 0) {
		if (b == 0) {
			if (c == 0) printf("-1\n");
			else printf("0\n");
		}
		else printf("1\n%.20lf\n", (double)c / b);
	}
	else {
		if (b * b - 4 * a * c > 0) printf("2\n%.20lf\n%.20lf\n", (double) (-b - sqrt(b * b - 4 * a * c))/ (a << 1), (double) (-b + sqrt(b * b - 4 * a * c))/ (a << 1));
		else if (b * b - 4 * a * c < 0) printf("0\n");
		else printf("1\n%.20lf\n", (double) -b / (a << 1));
	}
	
}