def tens(n):
    """
    :param n: n in 2..9
    :return: tens-word for n
    """
    if n == 2:
        return 'twenty'
    elif n == 3:
        return 'thirty'
    elif n == 4:
        return 'forty'
    elif n == 5:
        return 'fifty'
    elif n == 6:
        return 'sixty'
    elif n == 7:
        return 'seventy'
    elif n == 8:
        return 'eighty'

    return 'ninety'