from math import sqrt
x = input()

y = x.split()

a = int(y[0])
b = int(y[1])
c = int(y[2])

det = b**2-4*a*c

if det <0:
   print(0)
if det == 0:
   if a != 0:
      print(1)
      print("{0:5f}".format(-b/2*a))

   else:
      print(-1)
if det >0:      
      
   if a==0:
       print(-1)
       
   elif a==0 and b ==0:
       print(-1)
       
   else:
       print(2)
       print("{0:5f}".format((-b-sqrt(det))/2*a))
       print("{0:5f}".format((-b+sqrt(det))/2*a))

