#include <bits/stdc++.h>
using namespace std;
long long delta(long long a, long long b, long long c) {
  return b * b - 4 * a * c;
}
int main() {
  long long a, b, c;
  scanf("%I64d%I64d%I64d", &a, &b, &c);
  if (a == 0 && b == 0 && c == 0) {
    puts("-1");
    return 0;
  } else if (a == 0 && b == 0 && c != 0) {
    puts("0");
    return 0;
  } else if (a == 0 && b != 0) {
    puts("1");
    double x = (b * c > 0) ? -(sqrt(c * c) / sqrt(b * b))
                           : (sqrt(c * c) / sqrt(b * b));
    printf("%8lf", x);
    return 0;
  }
  int s;
  if (delta(a, b, c) < 0) {
    puts("0");
    return 0;
  } else if (delta(a, b, c) == 0) {
    puts("1");
    double x = -b / 2 * a;
    printf("%8lf", x);
    return 0;
  } else {
    puts("2");
    double x1 = (-b - sqrt(delta(a, b, c))) / 2 * a,
           x2 = (-b + sqrt(delta(a, b, c))) / 2 * a;
    printf("%8lf", x1);
    printf("\n");
    printf("%8lf", x2);
    return 0;
  }
}
