#include <stdio.h>

void vreme(int t, int* h, int* m, int* s){
	if(t<0 || t>24*60*60){
		*h = -1;
		return;
	}

	*h = t / 3600;
	*m = (t-*h*3600)/60;
	*s = t - *h*3600-*m*60;
}  

int main(){
	int t, h, m, s;
	
	scanf("%d", &t);
	vreme(t, &h, &m, &s);
	if(h==-1){
		printf("-1\n");
		return 1;
	}
	printf("%d:%d:%d\n", h, m, s);
	return 0;
}