def right(ctx, text, num_chars):
    """
    Returns the last characters in a text string
    """
    num_chars = conversions.to_integer(num_chars, ctx)
    if num_chars < 0:
        raise ValueError("Number of chars can't be negative")
    elif num_chars == 0:
        return ''
    else:
        return conversions.to_string(text, ctx)[-num_chars:]