#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)((long double)c / (long double)b));
	}
	else {
		if (a < 0) {
			a = -a;
			b = -b;
			c = -c;
		}
		long double ta(a), tb(b), tc(c);
		if (b * b - 4 * a * c > 0) printf("2\n%.20lf\n%.20lf\n", (double) (-tb - sqrt(tb * tb - 4 * ta * tc))/ (ta * 2), (double) (-tb + sqrt(tb * tb - 4 * ta * tc))/ (ta * 2));
		else if (b * b - 4 * a * c < 0) printf("0\n");
		else printf("1\n%.20lf\n", (double) -tb / (ta * 2));
	}
	
}