    for i in range(divisor):
        extended_keyword = extended_keyword + keyword
    return extended_keyword + extended_keyword[0:remainder]

def filter_sentence(sentence):
    """
        check each character of sentence with our english alphabet dictionary
        return filtered sentence
    """
    sent = ""
    for i in sentence.lower():
        if i in eng_alphabets:
            sent = sent + i
    return sent