import math
a,b,c = map(int,input().split(" "))

hantei = 0
left_num = int(math.pow(b,2))
right_num = int(4*a*c)
a_bunbo=int(2*a)


if a==0 and b==0 and c==0:
	hantei = -1
elif a==0 and b==0 and not(c==0):
	hantei = 0
elif a==0 and not(b==0):
	hantei ==1
else:
	hantei ==2

if hantei ==-1:
	print(-1)
elif hantei ==0:
	print(0)
elif hantei ==1:
	print(1)
	if c==0:
		if b>0:
			print(0)
		elif b <0:
			print(-0)
	if not(c==0):
		print(round(c/b,18))
else:
	if left_num== right_num:
		print(1)
		print(round(-b/a_bunbo,18))
	elif left_num> right_num:
		print(2)
		print(round(-(b+math.sqrt(left_num- right_num))/a_bunbo,18))
		print(round(-(b-math.sqrt(left_num- right_num))/a_bunbo,18))
	else:
		print(0)