def facet(review, product, user, facet_type):
    facet_type = facet_type.lower()
    if facet_type == 'none':
        return 'all'
    elif facet_type == 'age':
        return get_age_group(user, review)
    else:
        raise ValueError('Invalid facet type')
def main():
    counts = defaultdict(int)

    for line in sys.stdin:
        user = json.loads(line)
        age_group = get_age_group(user)
        counts[age_group] += 1

    print '"age_group","count"'
    for age_group, count in counts.iteritems():
        print '"{0}","{1}"'.format(age_group, count)