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

template<typename T>
void fin(T a){
  cout<<a<<endl;
  exit(0);
}

signed main(){
    int a,b;char c;cin>>a>>c>>b;
    b+=5;if(b>=60){b-=60;a++;}
    a%=24;
    cout<<a<<c<<b<<endl;
}