# include<stdio.h>
int main()
{
	int h,m,s;
	long long n;
	printf("请输入一个整数:\n");
	scanf("%lld",&n);
	n=n/1000;
		s=n%60;
		n=n/60;
		m=n%60;
		h=n/60;
	printf("%02d:%02d:%02d\n",h,m,s);
	return 0;
}