a = int(input("Enter a:"))
b = int(input("Enter b:"))
c = int(input("Enter c:"))
delta = b ** 2 - 4 * a * c
if delta < 0 :
    print("not root")
elif delta == 0:
    print("x1 = x2=",-b/(2.0*a))
else:
    print("x1=",(-b + delta ** 0.5) / (2.0 * a))
    print("x2=", (-b - delta ** 0.5) / (2.0 * a))