import os
import sys


start=' '



def tree(directory, indent):
        indentent = indent + '          '
        for x in os.listdir(directory):
                full = os.path.join(directory, x)
                if os.path.isdir(full):
                        print(indentent + x)
                        tree(full, indentent)
                else:
                        print(indentent + x)

if os.path.isdir(sys.argv[1]):
        directory = sys.argv[1]
        print(directory)
        tree(directory, start)
else:
        directory = os.getcwd()
        print(directory)
        tree(directory, start)