#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
#include <stdio.h>
using namespace std;
#define INIT cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)

int main()
{
    INIT;

    int h, m;
    char c;
    cin >> h >> c >> m;

    m += 5;
    if(m >= 60){
        h++;
        m -= 60;
    }
    if(h == 24) h = 0;

    if(h < 10 and m < 10) cout << '0' << h << ':' << '0' << m << endl;
    else if(h < 10 and m >= 10) cout << '0' << h << ':' << m << endl;
    else if(h >= 10 and m < 10) cout << h << ':' << '0' << m << endl;
    else cout << h << ':' << m << endl;

    return 0;
}