import java.util.Scanner;

public class Ex1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int firstPLayerTime = Integer.parseInt(scanner.nextLine());
        int secondPLayerTime = Integer.parseInt(scanner.nextLine());
        int thirdPLayerTime = Integer.parseInt(scanner.nextLine());

        int sum = firstPLayerTime + secondPLayerTime + thirdPLayerTime;

        int minutes = sum / 60;
        int seconds = sum % 60;

        System.out.printf("%d,%02d",minutes,seconds);

    }
}