import os
import os.path
file_list = os.listdir(".")

file = open("dir.txt","w")
directories = []
files = []

for elem in file_list:

  if os.path.isdir(elem):
      directories.append(elem)

  else:
      files.append(elem)
file.write("Directories\n\n")

directories.sort()

for dir in directories:
  file.write(dir  +"\n" )

file.write("\n\nFiles\n\n" )

files.sort()

for file_name in files:
  file.write(file_name  +"\n" )

file.close()