#! /usr/bin/env python3

import re, sys

if len(sys.argv)<2:
    print('usage: strongPassword [password] tests whether the password is at least 8 characters, contains both upper and lowercase, and has at least one digit/symbol, OR consists of at least 3 words of 4 letters each, containing both upper and lower case.')
    sys.exit()

def checkShortPassword(password):
    if len(password)<8:
        return false
    hasLower = re.search('[a-z]', password)
    hasCaps = re.search('[A-Z]', password)
    hasDigitOrSymbol = re.search('[\d]|[\W_\s]', password)
    #
    return hasLower and hasCaps and hasDigitOrSymbol

def checkLongPassword(password):
    has3Words = re.match('\s*\S+(?:\s+\S+){3,}', password)
    hasLower = re.search('[a-z]', password)
    hasCaps = re.search('[A-Z]', password)
    return has3Words and hasLower and hasCaps

password = sys.argv[1]

if checkLongPassword(password) or checkShortPassword(password):
    print('password is strong')
else:
    print('password is weak!')