// Time class
// Version 1.1
//
// New in this version: long methods moved out of the class
// declaration and declared as inline as appropriate.

#include <iostream>
using std::cout;
using std::cin;
using std::istream;
using std::ostream;

class Time
{
public:
    void initialize() { hours = minutes = 99; }
    void read(istream & in);
    void print(ostream & out) const;
    double minus(const Time & t2) const;

private:
    int hours, minutes;
};

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

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

inline double Time::minus(const Time & t2) const
{
    return (hours + minutes/60.0) -
        (t2.hours + t2.minutes/60.0);
}

void println(const Time & t, ostream & out)
{
    t.print(out);
    out << '\n';
}

int main()
{
    Time t;
    t.initialize();
    println(t, cout);

    return 0;
}