tef

from sys import stdin, stdout
import argparse

parser = argparse.ArgumentParser()
parser.add_argument('-r', action='store_const', const=True, required=False, default=False)
args = parser.parse_args()

stdout.writelines(sorted(stdin.readlines(), reverse = args.r))

tef

import collections
import itertools

def flattened(i):
    i = iter(i)
    while True:
        first = i.next()
        if isinstance(first, collections.Iterable):
            i = itertools.chain(first, i)
        else:

tef

import collections

def flatten(input, seen=None):
    for item in input:
        if isinstance(item, collections.Iterable):
            for sub in flatten(item):
                yield sub
        else:
            yield item

tef

import collections

def flatten(input):
    stack = list(reversed(input))
    while stack:
        top = stack.pop()
        if isinstance(top, collections.Iterable):
            stack.extend(list(reversed(top)))
        else:
            yield top