#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <sstream>
#include <complex>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <typeinfo>
#include <cassert>
#include <fstream>
#define REP(i,n) for(int i=0;i<n;i++)
#define FOR(a,b) for(:a<b;a++)
#define SSTR( x ) static_cast< std::ostringstream & >( \
        ( std::ostringstream() << std::dec << x ) ).str()
#define ALL(s) (s).begin(), (s).end()
using namespace std;
typedef long long unsigned int llu;
typedef long long ll;

int main (){
  string T;
  while (cin >> T){
    string hh = T.substr(0,2);
    string mm = T.substr(3,2);
    int h;
    int m;
    sscanf(hh.c_str(),"%d",&h);
    sscanf(mm.c_str(),"%d",&m);
    h +=  (m+5) / 60;
    m += 5;
    h %= 24;
    m %= 60;
    printf("%02d:%02d\n",h,m);
  }
  return 0;
}