s = [-1*int(x[1:]) if x[0] == '-' else int(x) for x in str(raw_input()).split(" ")]
a = s[0]
b = s[1]
c = s[2]
d = b**2-(4*a*c)
if a != 0:
	if d >= 0:
		print 2
		print str((-b-d**0.5)/(2*a)) + '0'*(7-len(str((-b-d**0.5)/(2*a))))
		print str((-b+d**0.5)/(2*a)) + '0'*(7-len(str((-b+d**0.5)/(2*a))))
	else:
		print 0
else:
	print 1
	print -c/b