#!/usr/bin/python
# -*- coding: utf-8 -*-

import re


def extract_minutes(string):
    pattern = r'^([0-9]|1[0-9]|2[0-3]):([0-5][0-9])$'
    out = re.search(pattern, string)

    if out is None:
        return '<NONE>'
    else:
        return out.group(2)