#!/usr/bin/python2

import random, string, sys

alnum_chars = filter(lambda c: c.isalnum(), map(chr, range(256)))
full_chars = alnum_chars * 2 + list("!@#%^&*(){}[]/=?+_-;:,.<>")

def generate(chars, length):
    return "".join([random.choice(chars) for i in xrange(length)])

def print_usage():
    print "Usage: %s [length] [alnum|full]" % sys.argv[0]
    sys.exit(1)

if __name__ == "__main__":
    if len(sys.argv) <= 1:
        n = 20
    elif sys.argv[1].isdigit():
        n = int(sys.argv[1])
    else:
        print_usage()

    if len(sys.argv) <= 2:
        chars = alnum_chars
    elif sys.argv[2] == "alnum":
        chars = alnum_chars
    elif sys.argv[2] == "full":
        chars = full_chars
    else:
        print_usage()

    print generate(chars, n)