// Constant methods

#include <iostream>
using namespace std;

class Time
{
public:
    void read(istream& in = cin)
    {
        in >> hours;
        in.get(); // colon
        in >> minutes;
    }

    void print(ostream& out = cout) const
    {
        out << hours << ':';
        if (minutes < 10) {
            out << 0;
        }
        out << minutes;
    }

    bool less_than(const Time& t) const
    {
        return (hours < t.hours) ||
                   (hours == t.hours && minutes < t.minutes);
    }

private:
    int hours;
    int minutes;
};

void println(const Time& t, ostream& out = cout)
{
    t.print(out);
    out << endl;
}

// Test driver for Time
int main()
{
    Time t;

    t.read();
    println(t);

    return 0;
}