include

using namespace std;

int main () {

int a1, a2, a3, a4, b1, b2, b3, b4, n;
cin >> n;
a1 = n / 3600;
b1 = n % 3600;
a2 = b1 / 60;
b2 = b1 % 60;
a3 = b2 / 1;
cout<<a1<<":"<<a2<<":"<<a3;
return 0;

} 2025-03-09 10:33:29 星期日