import java.io.*;

class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader =
            new BufferedReader(new InputStreamReader(System.in));

        String line = reader.readLine();
        int S = Integer.parseInt(line);
        if (S >= 0 && S < 86400) {
            int hour = S / 3600;
            S %= 3600;
            int minute = S / 60;
            int second = S % 60;
            System.out.println(hour + ":" + minute + ":" + second);
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz