#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

//template
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(a);i>(b);i--)
#define ALL(v) (v).begin(),(v).end()
typedef long long int ll; const int inf = 0x3fffffff; const ll INF = 0x3fffffffffffffff;
template<class T> inline bool chmax(T& a,T b){ if(a<b){a=b;return 1;}return 0; }
template<class T> inline bool chmin(T& a,T b){ if(a>b){a=b;return 1;}return 0; }
//template end



int main(){
    ll a,b,c; scanf("%lld%lld%lld",&a,&b,&c);
    if(a==0){
        if(b==0){
            printf(c?"0\n":"-1\n");
            return 0;
        }
        else{
            printf("1\n");
            double x=-c/b;
            printf("%.15f\n",x); return 0;
        }
    }
    if(b*b-4*a*c==0){
        printf("1\n");
        double x=-b/2/a;
        printf("%.15f\n",x); return 0;
    }
    if(b*b-4*a*c<0)printf("0\n");
    else{
        printf("2\n");
        double x=-b-sqrt(b*b-4*a*c); x/=2*a;
        printf("%.15f\n",x);
        x=-b+sqrt(b*b-4*a*c); x/=2*a;
        printf("%.15f\n",x); return 0;
    }
    return 0;
}