#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int hour,min;
    scanf("%d:%d",&hour,&min);
    min+=5;
    if(min>59)
    {
        hour++;
        min-=60;
    }
    if(hour>23)
    {
        hour-=24;
    }
    if(hour<10)
    {
        printf("%02d",hour);
    }
    else
    {
        printf("%d",hour);
    }
    printf(":");
    if(min<10)
    {
        printf("%02d",min);
    }
    else
    {
        printf("%d",min);
    }
}