#include <iostream>
#include <string>
using namespace std;

int main() {
    
    int h,m;
    scanf("%d:%d",&h,&m);
    m+=5;
    if(m >= 60){
        h+=1;
        m%=60;
    }
    if(h >= 24){
        h%=24;
    }
    if(h<10 && m<10)printf("0%d:0%d\n",h,m);
    else if(m<10)printf("%d:0%d\n",h,m);
    else if(h<10)printf("0%d:%d\n",h,m);
    else printf("%d:%d\n",h,m);
return 0;
}