import math
a,b,c=map(int,input().split())
if a!=0:
  if b**2-4*a*c<0:
    print(0)
  elif b**2-4*a*c==0:
    print(1)
    print((-b-math.sqrt(b**2-4*a*c))/(2*a))
  else:
    x1=(-b-math.sqrt(b**2-4*a*c))/(2*a)
    x2=(-b+math.sqrt(b**2-4*a*c))/(2*a)
    if b>0:
      x2=c/a/x1
    elif b<0:
      x1=c/a/x2
    print(2)
    print(x1)
    print(x2)
else:
  if b==0:
    if c==0:
      print(-1)
    else:
      print(0)
  else:
    print(1)
    print(-c/b)