/* -*- coding: utf-8 -*-
 *
 * 955.cc:  No.955 ax^2+bx+c=0 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

typedef long double ld;

/* global variables */

/* subroutines */

/* main */

int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);

  if (a == 0) {
    if (b == 0)
      printf("%d\n", (c == 0) ? -1 : 0);
    else
      printf("1\n%25Lf\n", (ld)c / b);
  }
  else {
    ld fa = a, fb = b, fc = c;
    ld dd = fb * fb - 4 * fa * fc;

    if (dd > 0.0) {
      ld d = sqrtl(dd);
      ld x0 = (-fb - d) / (fa * 2);
      ld x1 = (-fb + d) / (fa * 2);
      if (x0 > x1) swap(x0, x1);
      printf("2\n%.25Lf\n%.25Lf\n", x0, x1);
    }
    else if (dd == 0.0)
      printf("1\n%.25Lf\n", -fb / (fa * 2));
    else
      puts("0");
  }
  return 0;
}