#!/usr/bin/env python

import sys, operator, string

def characters(filename):
    for line in open(filename):
        for c in line:
            yield c

def all_words(filename):
    start_char = True
    for c in characters(filename):
        if start_char == True:
            word = ""
            if c.isalnum():
                # We found the start of a word
                word = c.lower()
                start_char = False
            else: pass
        else:
            if c.isalnum():
                word += c.lower()
            else:
                # We found the end of a word, emit it
                start_char = True
                yield word

def non_stop_words(filename):
    stopwords = set(open('../stop_words.txt').read().split(',')  + list(string.ascii_lowercase))
    for w in all_words(filename):
        if not w in stopwords:
            yield w

def count_and_sort(filename):
    freqs = {}
    for w in non_stop_words(filename):
        freqs[w] = 1 if w not in freqs else freqs[w]+1
    return sorted(freqs.iteritems(), key=operator.itemgetter(1), reverse=True)

#
# The main function
#

word_freqs = count_and_sort(sys.argv[1])

for tf in word_freqs[0:25]:
    print tf[0], ' - ', tf[1]