import sys

try:
    words = open("/usr/share/dict/ngerman", "r")
except:
    print("/usr/share/dict/ngerman nicht gefunden. Paket \"wngerman\" nicht installiert?")
    sys.exit(1)

if len(sys.argv) < 2:
    print("Syntax: python3 words.py abc")
    sys.exit(1)

letters = []
for letter in sys.argv[1]:
    if letter not in letters:
        letters.append(letter)

print("Suche nach Wörtern mit folgenden Buchstaben: ", letters, "\n")

matches = []

for word in words:
    match = True
    for letter in letters:
        if letter not in word:
            match = False
            break

    if match:
        matches.append(word)

print(matches)