#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <algorithm>
#include <set>
#include <map>
#include <bitset>
#include <cmath>
#include <functional>
#include <iomanip>
#define vll vector<ll>
#define vvvl vector<vvl>
#define vvl vector<vector<ll>>
#define VV(a, b, c, d) vector<vector<d>>(a, vector<d>(b, c))
#define VVV(a, b, c, d) vector<vvl>(a, vvl(b, vll (c, d)));
#define re(c, b) for(ll c=0;c<b;c++)
#define all(obj) (obj).begin(), (obj).end()
typedef long long int ll;
typedef long double ld;
using namespace std;

int main(int argc, char const *argv[]) {
  string s;std::cin >> s;
  ll num = (s[0]-'0') * 600;
  num += (s[1]-'0') * 60;
  num += (s[3]-'0') * 10;
  num += (s[4]-'0');
  num += 5;
  ll x = 24*60;
  num%=x;
  ll a = num/600;
  num%=600;
  ll b = num/60;
  num%=60;
  ll c = num/10;
  num%=10;
  ll d = num;
  std::cout << a<<b<<":"<<c<<d << '\n';
}