import static java.lang.Integer.parseInt;

public class Main {
    public static void main (String[] args) {
        String line = new java.util.Scanner ( System.in ).nextLine();
        String hour = watch (line);
        System.out.println(hour);
    }
    public static String watch(String line){
        int hour,min,second;
        second = parseInt(line);
        if (second < 0 || second > 86400) {
            System.out.println("Constraints Error");
            return null;
        }
        hour = second / 3600;
        min = (second % 3600 ) / 60;
        second = second % 60;
        
        return hour + ":" + min + ":" + 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