111335 Статистика по файлу

import string

F = open('input.txt', 'r')
words = 0
letters = 0
text = F.readlines()
lines = len(text)

for line in text:
    w = ''
    for s in line.strip()+' ':
        if s in string.ascii_letters:
            letters += 1
            w += s
        if  s in " '-.,!?" and w:
            words += 1
            #print(w)
            w = ''



print("""Input file contains:
"""+str(letters)+""" letters
"""+str(words)+""" words
"""+str(lines)+""" lines""")