#include "stdio.h"

int main(int argc, char* argv[])
{
	int n,a,b,c;
	scanf ("%d",&n);
	a=(n/3600)%24;
	b=(n-n/3600*3600)/60%60;
	c=(n-n/3600*3600-(n-n/3600*3600)/60*60)%60;
	printf("%02d:%02d:%02d\n",a,b,c);
}
/**************************************************************
	Problem: 1081
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/