gistfile1.py

import sys

if len(sys.argv) <= 1:
    sys.argv.append("/usr/share/dict/words")

f = open(sys.argv[1], "r")

order = "qazwsxedcrfvtgbyhnujmikolp"

for line in f:
    high = -1
    word = ""
    for c in line:
        if c in order:
            pos = order.index(c)
            if pos > high:
                word += c
                high = pos
            else:
                high = -1
                break
    if high != -1:
        print word