#include using namespace std; typedef long long ll; typedef pair pii; typedef pair pll; #define ep emplace_back #define pb push_back #define mp make_pair #define rep(i,n) for(int i=0;i<(n);++i) constexpr int mod=1000000007; constexpr int mod1=998244353; vector dx={0,1,0,-1},dy={-1,0,1,0}; bool inside(int y,int x,int h,int w){ if(y=0 && x=0) return true; return false; } template inline bool chmin(T& a, T b){ if(a > b){ a = b; return true; } return false; } template inline bool chmax(T& a, T b){ if(a < b){ a = b; return true; } return false; } int main(){ cin.tie(0); ios::sync_with_stdio(false); ll a,b,c;cin >> a >> b >> c; if(a == 0){ cout << -1 << endl; return 0; } if(b * b - 4 * a * c < 0){ cout << 0 << endl; return 0; } if(b * b - 4 * a * c == 0){ cout << 1 << endl; cout << setprecision(20) << fixed << -b / (2 * a) << endl; return 0; } double ans1 = (double)(-b + sqrt(b * b - 4 * a * c)) / (double)(2 * a), ans2 = (double)(-b - sqrt(b * b - 4 * a * c)) / (double)(2 * a); cout << 2 << endl; cout << setprecision(20) << fixed << ans2 << endl << ans1 << endl; }