#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define rrep(i,m,n,k) for (int i = (int)(m); i > (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}

int main(){

    long long a,b,c;
    cin >> a >> b >> c;
    if(a==0){
        if(b==0){
            if(c==0){
                cout << -1 << endl;
                return  0;
            }
            else{
                cout << 0 << endl;
                return 0;
            }
        }
        else{
            cout << 1 << endl;
            cout << -(long double)c/(long double)b << endl;
            return 0;
        }
    }
    else{
        long long D = b*b - 4*a*c;
        if(D==0){
            cout << 1 << endl;
            cout << fixed << setprecision(12);
            cout << - (long double)b/(long double)(2*a) << endl;
            return 0;
        }
        else if (D<0){
            cout << 0 << endl;
            return 0;
        }
        else{
            long double x;
            if(b>0){
                x = ((long double)(-b) - sqrt((long double)D))/(long double)(2*a);
            }
            else{
                x = ((long double)(-b) + sqrt((long double)D))/(long double)(2*a);
            }
            long double y = (long double)c/(long double)(a)/x;
            cout << 2 << endl;
            cout << fixed << setprecision(12);
            cout << min(x,y) << endl;
            cout << max(x,y) << endl;
            return 0;
            
        }
    }

}