#include <bits/stdc++.h>
using namespace std;

int main() {
    string time;
    cin >> time;
    string h(time.begin(), time.begin()+2);
    string m(time.begin()+3, time.begin()+5);

    int hh = stoi(h);
    int mm = stoi(m);

    mm += 5;
    if(mm > 60) {
        hh++;
        mm -= 60;
        if(hh == 24) hh = 0;
    }

    string h_out = to_string(hh);
    string m_out = to_string(mm);

    if(h_out.size() == 1) h_out = '0' + h_out;
    if(m_out.size() == 1) m_out = '0' + m_out;

    cout << h_out << ':' << m_out << '\n';

    return 0;
}