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

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

if left_num== right_num and not(a==0 and b==0) or (a==0 and c==0 and (b<0 or b>0)):
	print(1)
	if a > 0 or a < 0:
		print(round(-b/a_bunbo,18))
elif left_num> right_num and not(a==0 and c==0 and (b<0 or b>0)):
	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))
elif (a==0 and b==0 and c ==0):
	print(-1)
else:
	print(0)