#!/usr/bin/python

import sys
import yaml

def comma(x, y):
  if x:
    return '{0},{1}'.format(x, y)
  else:
    return str(y)

def print_obj(obj, lead=''):
  if type(obj) == dict:
    for k in obj:
      print_obj(obj[k], comma(lead, k))
  else:
    print(comma(lead, obj))

with open(sys.argv[1]) as f:
  print_obj(yaml.load(f))