#!/usr/local/bin/python3
dirnames = ['1','2','_3','4','5','6','7','8','_9','0']
for i in range(100000):
  i = 0
  dir_count = len(dirnames)
  while i < dir_count:
    if dirnames[i].startswith('_'):
      del dirnames[i]
      dir_count -= 1
      continue
    i += 1
print(dirnames)