#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int a[334], N, p, b;

int main()
{
    int n, m;
    scanf("%d:%d", &n, &m);
    m += 5;
    if (m > 59)
        n++, m %= 60;
    n = (n > 23 ? 0 : n);
    printf("%02d:%02d", n, m);
}