#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define o(a) cout << a << endl
#define int long long
#define fi first
#define se second
using namespace std;
typedef pair<int, int> P;

int change_to_i(string s){
    stringstream ss; int k;
    ss<<s; ss>>k;
    return k;
}

signed main(){
    int h, m;
    string s;
    cin >> s;
    h = change_to_i(s.substr(0, 2));
    m = change_to_i(s.substr(3, 5));
    m += 5;
    if(m >= 60){
        h++;
        m -= 60;
    }
    if(h >= 24){
        h -= 24;
    }
    printf("%02lld:%02lld\n", h, m);
}