ovo

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    int a=0,b=0,c=0;
    int seconds=0;
    cin>>seconds;
    a=seconds/3600;
    b=(seconds-a*3600)/60;
    c=seconds-a*3600-b*60;
    cout <<a<<":"<<b<<":"<<c<<endl;

    return 0;
}