#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i;
	cin>>n;
	for(i=0;n>=3600;i++){
		n-=3600;
	}
	cout<<i/10<<i%10<<":";
	for(i=0;n>=60;i++){
		n-=60;
	}
	cout<<i/10<<i%10<<":";
	for(i=0;n!=0;i++){
		n--;
	}
	cout<<i/10<<i%10;
	return 0;
}

/**************************************************************
	Problem: 1081
	User: zzz
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/