Numbers

   #!/usr/bin/python3.9
   ListA= '/home/user/Desktop/Numbers.txt'
   print('Enter your number:')
   x = int(input())

   if x in int(ListA):
       print('Duplicate, this Number already in List')
  else:
     with open('/home/user/Desktop/Numbers.txt','a')as f:
          f.write('\n')
          f.write(x)
  f.close()