#include <iostream>
using namespace std;
int main() {
int s;
cin >> s;
int m = (s / 60) % 60, h = (s / 3600) % 24;
int m1 = m / 10;
int m2 = m % 10;
int T = ((s % 3600) % 60);
int T1 = T / 10;
int T2 = T % 10;
cout << h << ":" << m1 << m2 << ":" << T1 << T2;
return 0;
}