#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c;
  scanf("%I64d%I64d%I64d", &a, &b, &c);
  if (a == 0) {
    if (b == 0)
      printf("%d", (c == 0 ? -1 : 0));
    else
      printf("1\n%.10f", -1.0 * c / b);
  } else {
    double res[2];
    long long det = b * b - 4 * a * c;
    if (det < 0)
      printf("0");
    else if (det == 0)
      printf("1\n%.10f", -0.5 * b / a);
    else {
      res[0] = (-b + sqrt(det)) / (2 * a);
      res[1] = (-b - sqrt(det)) / (2 * a);
      sort(res, res + 2);
      printf("2\n%.10f\n%.10f", res[0], res[1]);
    }
  }
  return 0;
}
