def check_pangram(text):
    """
        is the given text is a pangram.
    """
    alphabet = list(map(chr, range(97, 123)))
    for letter in text.lower():
        if len(alphabet) == 0:
            return True
        if letter in alphabet:
            alphabet.remove(letter)
    if len(alphabet) == 0:
        return True
    return False


if __name__ == '__main__':
    # These "asserts" using only for self-checking and not necessary for auto-testing
    assert check_pangram("The quick brown fox jumps over the lazy dog."), "brown fox"
    assert not check_pangram("ABCDEF"), "ABC"
    assert check_pangram("Bored? Craving a pub quiz fix? Why, just come to the Royal Oak!"), "Bored?"
    print('If it is done - it is Done. Go Check is NOW!')