#include<iostream>
#include<string>

using namespace std;

int main()
{
    int h,m;
    scanf("%d:%d", &h, &m);
    m+=5;
    if (m>59) {
        h+=m/60;
        m%=60;
    }
    if(h>23) { h%=24; }
    printf("%02d:%02d\n",h,m);
    return 0;
}