#include <bits/stdc++.h>
#define be(v) (v).begin(),(v).end()
#define pb(q) push_back(q)
#define rep(i, n) for(int i=0;i<n;i++)
#define all(i, v) for(auto& i : v)
typedef long long ll;
using namespace std;
const ll MOD7 = 1000000007, MOD998 = 998244353, INF = (1LL<<60);
#define doublecout(a) cout<<fixed<<setprecision(15)<<a<<endl;

// ctrl-E

typedef long double ld;
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll a, b, c;
    cin >> a >> b >> c;
    if(a == 0) {
        if(b == 0) {
            cout << (c ? 0 : -1) << endl;
        } else {
            cout << 1 << endl;
            doublecout(- (ld)c / (ld)b);
        }
        return 0;
    }
    ll D = b * b - a * c * 4;
    if(D < 0) {
        cout << 0 << endl;
    } else if(D == 0) {
        cout << 1 << endl;
        doublecout(- (ld)b / (ld)(a * 2));
    } else {
        cout << 2 << endl;
        ld A = (ld)a;
        ld B = (ld)b;
        ld C = (ld)c;
        ld a2 = A * (ld)2;
        ld pm = sqrt(B*B - A*C* (ld)4);
        ld base = - (ld)b / a2;
        pm /= a2;
        doublecout(base - pm);
        doublecout(base + pm);
    }
    return 0;
}