class Subtitles {
    private List<Subtitle> subtitles;

    public Subtitles() {
        subtitles = new ArrayList<Subtitle>();
    }

    @SuppressWarnings("resource")
    public int loadSubtitles(InputStream inputStream) {
        Scanner input = new Scanner(inputStream);
        String line;
        while (input.hasNextLine()) {
            line = input.nextLine();
            if (line.trim().length() == 0)
                break;
            int number = Integer.parseInt(line);
            String time = input.nextLine();
            StringBuilder text = new StringBuilder();
            while (input.hasNextLine()) {
                line = input.nextLine();
                if (line.trim().length() == 0) {
                    break;
                }
                text.append(line);
                text.append("\n");
            }
            Subtitle sub = new Subtitle(number, time, text.toString());
            subtitles.add(sub);

        }
        return subtitles.size();

    }

    public void print() {
        for (Subtitle e : subtitles) {
            System.out.println(e);
        }
    }

    public void shift(int ms) {
        for (Subtitle e : subtitles) {
            e.shift(ms);
        }
    }
}

class Subtitle {
    private int number;
    private int textFrom;
    private int textTo;
    private String text;

    public Subtitle(int num, String time, String text) {
        this.number = num;
        String[] parts = time.split(" --> ");
        textFrom = fromStringToTime(parts[0]);
        textTo = fromStringToTime(parts[1]);
        this.text = text;

    }

    public int fromStringToTime(String time) {
        String[] parts = time.split(":");
        int hour = Integer.parseInt(parts[0]);
        int min = Integer.parseInt(parts[1]);

        parts = parts[2].split(",");
        int sec = Integer.parseInt(parts[0]);
        int ms = Integer.parseInt(parts[1]);

        int result = ms + sec * 1000 + min * 60 * 1000 + hour * 60 * 60 * 1000;
        return result;
    }

    public void shift(int ms) {
        textFrom += ms;
        textTo += ms;
    }

    public String timeToString(int time) {
        int h = time / (60 * 60 * 1000);
        time = time % (60 * 60 * 1000);
        int m = time / (60 * 1000);
        time = time % (60 * 1000);
        int s = time / 1000;
        int ms = time % 1000;
        return String.format("%02d:%02d:%02d,%03d", h, m, s, ms);
    }

    @Override
    public String toString() {
        return String.format("%d\n%s --> %s\n%s", number, timeToString(textFrom), timeToString(textTo), text);
    }

}