#include<bits/stdc++.h>
using namespace std;
typedef long long ll;


bool chmax(int &a,int b){
    if(a<b){
        a = b;
        return 1;
    }
    return 0;
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(50);
    
    
    long double a,b,c;
    cin>>a>>b>>c;
    if(a==0 && b==0){
        if(c)cout << 0 << endl;
        else cout << -1 << endl;
        return 0;
    }
    if(a==0){
        cout << 1 << endl;
        cout << (long double)(-c/b) << endl;
        return 0;
    }
    double ans1,ans2;
    if(b*b < 4*a*c){
        cout << 0 << endl;
        return 0;
    }
    if(b*b == 4*a*c){
        cout << 1 << endl;
        double ans = (long double)(-b / (2.0*a));
        cout << ans << endl;
        return 0;
    }
    cout << 2 << endl;
    long double t = b*b - 4.0*a*c;
    long double low = 0.0,up=1e9;
    int cnt = 0;
    while(cnt < 1050){
        cnt++;
        long double mid = (up+low)/2.0;
        if(mid*mid > t) up = mid;
        else low = mid;
    }
    long double j = low;
    ans1 = (long double)( -b + j);
    ans2 = (long double)( -b - j);
    ans1 /= (long double)2.0*a;
    ans2 /= (long double)2.0*a;
    if(a<0) swap(ans1,ans2);
    cout << ans2 << endl;
    cout << ans1 << endl;
    return 0;

}