#include <stdio.h>
#include <stdint.h>
#include <math.h>
#include <inttypes.h>
int main(void) {
	// your code goes here
	float age = 219600;
    const float_t  seconds = fmodf(age, 60);
    const uint32_t minutes = ((uint32_t)(age / 60)) % 60;
    const uint32_t hours   = (uint32_t)(age / 3600);
    printf("%02" PRIu32 ":%02" PRIu32 ":%06.3f ago", hours, minutes, seconds);
	return 0;
}