#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

const long long MAX = 5100000;
const long long INF = 1LL << 60;
const long long mod = 1000000007LL;
//const long long mod = 998244353LL;

using namespace std;
typedef unsigned long long ull;
typedef long long ll;


int main()
{
	/*
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	*/

	ll a, b, c; cin >> a >> b >> c;
	if (a == 0) {
		if (b == 0) {
			if (c == 0) puts("-1");
			else puts("0");
		}
		else {
			puts("1");
			long double bl = b;
			long double cl = c;
			cout << fixed << setprecision(20) << -cl / bl << endl;
		}
	}
	else {
        if(a<0){
          a *= -1;
          b *= -1;
          c *= -1;
        }
		if (b*b - 4 * a*c > 0) {
			puts("2");
			long double al = a;
			long double bl = b;
			long double cl = c;
			long double res1 = (-bl + sqrt(bl*bl - 4 * al*cl)) / (2 * al);
			long double res2 = (-bl - sqrt(bl*bl - 4 * al*cl)) / (2 * al);
			cout << fixed << setprecision(20) << res2 << "\n" << res1 << endl;
		}
		else if (b*b - 4 * a* c == 0) {
			puts("1");
			long double res = -(long double)b / (long double)(2 * a);
			cout << fixed << setprecision(20) << res << endl;
		}
		else {
			puts("0");
		}
	}
	return 0;
}