//
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> P;
typedef pair<ll, P>IP;
typedef vector<ll> V;
typedef vector<V> V2;
typedef vector<vector<P> > G;
void g_dir(G &graph, ll a, ll b, ll w = 1){graph[a].push_back(P(b, w));}
void g_undir(G &graph, ll a, ll b, ll w = 1){g_dir(graph, a, b, w);g_dir(graph, b, a, w);}
#define rep(i, n) for(ll (i) = 0; (i) < (n); (i)++)
#define rep1(i, n) for(ll (i) = 1; (i) <= (n); (i)++)
#define rrep(i, n) for(ll (i) = (n) - 1; (i) >= 0; (i)--)
#define rrep1(i, n) for(ll (i) = (n); (i) >= 1; (i)--)
template<class T> void chmax(T &a, const T &b){if(a < b){a = b;}}
template<class T> void chmin(T &a, const T &b){if(a > b){a = b;}}
const ll INF = 1145141919;
const ll MOD = 1000000007;
const ll NUM = 101010;

int main(){

    ll a, b, c;
    cin >> a >> b >> c;
    if(a == 0 && b == 0 && c == 0)cout << -1 << endl;
    else if(a == 0 && b == 0)cout << 0 << endl;
    else if(a == 0){
        cout << 1 << endl;
        ld ans = -c;
        ans /= b;
        cout << fixed << setprecision(30);
        cout << ans << endl;
    }
    else if(b * b - 4 * a * c < 0)cout << 0 << endl;
    else if(b * b - 4 * a * c == 0){
        cout << 1 << endl;
        ld ans = -b;
        ans /= ld(2 * a);
        cout << fixed << setprecision(30);
        cout << ans << endl;
    }
    else{
        cout << 2 << endl;
        cout << fixed << setprecision(30);
        ld x1, x2;
        // 異符号の浮動小数点数同士の加算で有効桁数が大幅に減る
        if(b < 0)x1 = ld(-b) + sqrt(ld(b * b - 4 * a * c));
        else x1 = ld(-b) - sqrt(ld(b * b - 4 * a * c));
        x1 /= ld(2 * a);
        x2 = ld(c) / ld(x1 * a);
        cout << min(x1, x2) << endl;
        cout << max(x1, x2) << endl;
        
    }

    return 0;
}