#include <bits/stdc++.h>
using namespace std;
int main() {
    string s;
    cin>>s;
    int hh = stoi(s.substr(0,2));
    int mm = stoi(s.substr(3,2));
    mm += 5;
    hh += mm / 60;
    mm %= 60;
    hh %= 24;
    cout<<(hh<10?"0":"")<<hh<<":"<<(mm<10?"0":"")<<mm<<endl;
    return 0;
}