#include <iostream>
using namespace std;

int main(void)
{
    string time;
    int hh, mm;
    cin >> time;

    hh = (time[0] - '0') * 10 + time[1] - '0';
    mm = (time[3] - '0') * 10 + time[4] - '0' + 5;

    if (mm >= 60)
    {
        mm -= 60;
        hh++;
    }

    if (hh >= 24)
    {
        hh -= 24;
    }

    time[0] = hh / 10 + '0';
    time[1] = hh % 10 + '0';
    time[3] = mm / 10 + '0';
    time[4] = mm % 10 + '0';
    cout << time << endl;

    return 0;
}