#include <stdio.h>

int main(){
    int hour, minute;
    int flag = 0;

    scanf("%d:%d", &hour, &minute);
    if((minute += 5) >= 60){
        flag = 1;
        minute -= 60;
    }
    if(flag == 1){
        if((++hour) >= 24){
            hour -= 24;
        }
    }

    printf("%02d:%02d\n", hour, minute);

    return 0;

}