#include <iostream>
#include <iomanip> // Thư viện để định dạng output
 
using namespace std;
 
int main() {
    int n;
    cin >> n;
 
    int hours = n / 3600;
    int minutes = (n % 3600) / 60;
    int seconds = n % 60;
 
    // In ra kết quả với định dạng 2 chữ số cho giờ, phút, giây
    cout << setfill('0') << setw(2) << hours << ":"
         << setfill('0') << setw(2) << minutes << ":"
         << setfill('0') << setw(2) << seconds << endl;
 
    return 0;
}
 

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