// Inline methods

#include <iostream>
using namespace std;

class Time
{
public:
    Time() : Time(99, 99) {}
    Time(int h) : Time(h, 0) {}
    Time(int h, int m) : hours(h), minutes(m) {}

    void read(istream& in = cin);
    void print(ostream& out = cout) const;

    bool less_than(const Time& t) const;

private:
    int hours;
    int minutes;
};

inline void Time::read(istream& in)
{
    in >> hours;
    in.get(); // colon
    in >> minutes;
}

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

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

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

// Test driver for Time
int main()
{
    return 0;
}