dotsfile = open('dots.txt', 'r')
wantedfile = open('wanted.txt', 'r')

def commandStrip(sentence):
    for line in dotsfile:
        line=line.strip('\n')
        sentence = sentence.replace(line, "")
    return sentence

def searchKeyWords(sentence):
    found = []
    for line in wantedfile:
        line=line.strip('\n')
        if sentence.find(line) >= 0:
            found.append(line)

    if found:
        return found
    return 1

temp = commandStrip("Guten tag, ich want you to pick up big red triangle.")
temp = searchKeyWords(temp)
if temp!=1:
    print("I have found words: " + " ".join(temp))

dotsfile.close()
wantedfile.close()