#include <stdio.h>
#include <iostream>
#include <math.h>
#include <assert.h>
#include <iomanip>
using namespace std;
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 {
		long double ta(a), tb(b), tc(c), d, sa, sb, l, r, mid;
		d = b * b - 4 * a * c;
		
		if (b * b - 4 * a * c > 0) {
			l = -d;
			r = d;
			for (int i = 0; i < 1000; i++) {
				mid = (l + r) / 2;
				if (mid * mid > d) r = mid;
				else l = mid;
			}
			sa = (-tb + l) / ta / 2; 
			sb = (-tb - l) / ta / 2; 
			if (sa < sb) {
				cout << 2 << '\n';
				cout << setprecision(80) << sa << '\n';
				cout << setprecision(80) << sb << '\n';
			}
			else {
				cout << 2 << '\n';
				cout << setprecision(80) << sb << '\n';
				cout << setprecision(80) << sa << '\n';
			}
		}
		else if (b * b - 4 * a * c < 0) printf("0\n");
		else printf("1\n%.20lf\n", (double) (-tb / (ta * 2)));
		
	}
	
}