#!/usr/bin/env python3
#coding:utf-8

import math
import string
import random
import heapq
from sys import stdin
# import numpy as np
# from matplotlib import pyplot as plt

def D(a,b,c):
	return b*b-a*c*4

def main():
	read=stdin.readline

	#edit here!
	a,b,c=map(int,read().split())
	if a==0:
		if b==0:
			if c==0:
				print(-1)
			else:
				print(0)

		else:
			print(1)
			print(f"{-c/b:.30f}")
	else:
		if D(a,b,c)<0:
			print(0)
		elif D(a,b,c)==0:
			print(1)
			print(f"{-b/(a*2):.30f}")
		else:
			print(2)
			print(f"{(-b-math.sqrt(b*b-a*c*4))/(a*2):.30f}")
			print(f"{(-b+math.sqrt(b*b-a*c*4))/(a*2):.30f}")

if __name__ == '__main__':
	main()