c = int(input('Enter 2 to start'))

while c != 1:

   import math as m

   a = int(input('Write a: '))

   b = int(input('Write b: '))

   c = int(input('Write c: '))

   D = (b ** 2) - (4 * a * c)

   print ('D =',D)

   if D > 0:

       print('D > 0')

       x = (-b + (m.sqrt(D))) / (2 * a)

       x1 = (-b - (m.sqrt(D))) / (2 * a)

       print ('x1 =',x)

       print ('x2 =',x1)

   elif D == 0:

       print('D = 0')

       x = -b / (2 * a)

       print ('x =',x)

   else:

       print('D < 0')

       print ('No roots')

   c = int(input('Enter 1 to quit or 2 to repeat'))