#!/usr/bin/env python3
import sys

words = [
    "about",
    "after",
    "again",
    "below",
    "could",
    "every",
    "first",
    "found",
    "great",
    "house",
    "large",
    "learn",
    "never",
    "other",
    "place",
    "plant",
    "point",
    "right",
    "small",
    "sound",
    "spell",
    "still",
    "study",
    "their",
    "there",
    "these",
    "thing",
    "think",
    "three",
    "water",
    "where",
    "which",
    "world",
    "would",
    "write",
]

index = 0
poss = words

for arg in sys.argv[1:]:
    idcs = []
    if len(arg) == 0 or arg == "-":
        index += 1
        continue

    for i in range(len(poss)):
        if poss[i][index] in arg:
            idcs.append(i)

    poss = [poss[i] for i in idcs]
    index += 1

print(poss)