# A python program to find roots of a 
# quadratic equation.
import math 
data = raw_input("Enter a, b, c: ")
dl = data.split(" ")
a = float(dl[0])
b = float(dl[1])
c = float(dl[2])
if a == 0.0 and b == 0.0:
   print "Invalid data"
elif a == 0.0: 
   print "Linear equation: x =", -c/b
else:
   disc = b*b - 4*a*c
   if disc < 0.0: 
      print "No real root"
   elif disc == 0.0: 
      print "Equal roots: x =", -b/2/a
   else:
      sqrtD = math.sqrt(disc)
      print "Roots are: x1 =", (-b+sqrtD)/2/a,  "x2 =", (-b-sqrtD)/2/a