#include <stdio.h>

int main(void){
	int h,m;
	scanf("%d:%d",&h,&m);
	
	m = m + 5;
	
	if(m >= 60){
		m = m - 60;
		h = h + 1;
	}
	
	if(h >= 24){
		h = h - 24;
	}
	
	printf("%02d:%02d\n",h,m);
	
	return 0;
}