import sys
import math

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

if a == 0 and b == 0 and c == 0:
  print(-1)
  sys.exit()

if a == 0 and b == 0:
  print(0)
  sys.exit()

if a == 0:
  print(1)
  print(-c / b)
  sys.exit()

D = b**2-4*a*c
if D < 0:
  print(0)
  sys.exit()

if D == 0:
  print(1)
  print(-b / (2*a))
  sys.exit()

print(2)
if b < 0:
  a *= -1
  b *= -1
  c *= -1
x1 = (-b - math.sqrt(D)) / (2*a)
x2 = (b**2 - D) / (2*a) / (-b - math.sqrt(D))

if a > 0:
  print(x1)
  print(x2)
else:
  print(x2)
  print(x1)