#!/usr/bin/python

# Expected input is a file, where blocks of lines are separated by newline.

# Blocks will be sorted.

# Intention is to prepare files for comparison, were lines inside each block are

# in stable order, but the order of blocks is random.

import sys

import string

if (len(sys.argv) != 2):

    print "syntax: " + sys.argv[0] + " input-filename"

    sys.exit(1)

filename = sys.argv[1]

block = []

block_list = []

with open(filename, 'r') as f:

    for line in f:

        if (len(line) == 1):

            if len(block) == 0:

                continue

            else:

                combined_string = string.join(block, '')

                block_list.append(combined_string)

                block = []

        else:

            block.append(line)

block_list.sort()

for block in block_list:

    print block