#!/usr/bin/env python

import sys
from operator import itemgetter

wordcounts = {}

for line in open(sys.argv[1]).readlines():
    for word in [x for x in line.rstrip().lower().split() if x.isalpha()]:
        wordcounts[word] = wordcounts.get(word, 0) + 1

for (word, ct) in sorted(wordcounts.items(), key=itemgetter(1), reverse=True):
    print '%s\t%s' % (ct, word)