#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>


typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;

    while (Q--) {
       
        string p;
        cin >> p;
        int m=0,h=0;
        m += p[p.size() - 1] - '0';
        m += (p[p.size() - 2] - '0')*10;
        h += p[1] - '0';
        h += (p[0] - '0') * 10;
        m += 5;
        if (m >= 60) {
            h++;
            h %= 24;
            m %= 60;
        }
        if (h < 10)cout << 0;
        cout << h << ":";
        if (m < 10)cout << 0;
        cout << m;

        
        

    }
    return 0;
}