#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    string S;
    cin >> S;
    
    int h = (S[0]-'0')*10 + S[1]-'0';
    int m = (S[3]-'0')*10 + S[4]-'0';
    
    m += 5;
    
    h += m/60;
    h %= 24;
    
    m %= 60;
    
    string H,M;
    H = ( h < 10 ? "0" : "" ) + to_string(h);
    M = ( m < 10 ? "0" : "" ) + to_string(m);
    
    cout << H << ":" << M << endl;
    
    return 0;
}