#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;cin>>n;
    if(n>=60)
    {
        cout<<"22:";
        if(n-60<10)
        {
            cout<<"0"<<n-60;
        }
        else 
        {
            cout<<n-60;
        }
    }
    else{
        if(n<10)
        {
            cout<<"21:0"<<n;
        }
        else{
            cout<<"21:"<<n;
        }
    }
    return 0;
}