#include <stdio.h>
int main(void){
    int a,b;
    scanf("%d %d",&a,&b);
    b=b+5;
    if(b>=60){a++;b=b-60;}
    if(a>=24){a=0;}
    if(a<10){printf("0%d:",a);}
    else{printf("%d:",a);}
    if(b<10){printf("0%d\n",b);}
    else {printf("%d\n",b);}
    return 0;
}