#include <bits/stdc++.h>
using namespace std;
int main() {
  double a, b, c;
  scanf("%lf%lf%lf", &a, &b, &c);
  if (a != 0) {
    double d = b * b - 4 * a * c;
    if (d > 0) {
      double x1 = (-b - sqrt(d)) / (2 * a), x2 = (-b + sqrt(d)) / (2 * a);
      if (x1 > x2) swap(x1, x2);
      printf("2\n%.9f\n%.9f\n", x1, x2);
    } else if (d == 0)
      printf("1\n%.9f\n", -b / (2 * a));
    else
      printf("0\n");
  } else {
    if (b != 0)
      printf("1\n%.9f\n", -c / b);
    else {
      if (c != 0)
        printf("0\n");
      else
        printf("-1\n");
    }
  }
  return 0;
}
