class Main
{
    public static void main (String[] args) throws java.lang.Exception
	{
		String times = "5:15 | 4:41 | 4:27 | 3:13 | 5:01 | 4:47 | 4:50 | 5:20";
		String[] timesSplit = times.split(" | ");

		int hour = 0;
		int minute = 0;

		for(int i = 0; i < timesSplit.length; i+=2) {
			String[] time = timesSplit[i].split(":");
			hour += Integer.parseInt(time[0]);
			minute += Integer.parseInt(time[1]);
		}

		hour += minute / 60;
		minute %= 60;

		String result = hour + ":" + minute;
		System.out.println(result);
	}
}