#include <iostream>
#include <iomanip>

using namespace std;

class Time
{
private:
    void normalize();
    int hours;
    int minutes;
    int seconds;
public:
    Time()
    {
        seconds = 0;
        minutes = 0;
        hours   = 0;
    }
    Time(int h, int m, int s)
    {
        hours   = h;
        minutes = m;
        seconds = s;
        normalize();
    }

    friend Time operator + (const Time &t1, const Time &t2);
    friend Time operator - (const Time &t3, const Time &t4);
    friend bool operator < (const Time &t1, const Time &t3);
    friend ostream &operator << (ostream &output, Time &t);
    friend istream &operator >> (istream &input, Time &t);
};

istream &operator >> (istream &input, Time &t)
{
    input >> t.hours >> t.minutes >> t.seconds;
    t.normalize();
    return input;
}

ostream &operator << (ostream &output, Time &t)
{
    output << setfill('0') << setw(2) << t.hours << ":"
    << setfill('0') << setw(2) << t.minutes << ":"
    << setfill('0') << setw(2) << t.seconds;
    return output;
}


Time operator + (const Time &t1, const Time &t2)
{
    Time result;
    result.hours = t1.hours + t2.hours;
    result.minutes = t1.minutes + t2.minutes;
    result.seconds = t1.seconds + t2.seconds;
    result.normalize();
    return result;
}

Time operator - (const Time &t3, const Time &t4)
{
    Time result;
    result.hours = t3.hours - t4.hours;
    result.minutes = t3.minutes - t4.minutes;
    result.seconds = t3.seconds - t4.seconds;
    result.normalize();
    return result;
}

bool operator<(const Time &t1, const Time &t3)
{
    return true;
}

int main()
{
    Time t1, t2, t3, t4;
    cin >> t1;
    cin >> t2;
    cin >> t3;

    cout << "Time1: " << t1 << endl;
    cout << "Time2: " << t2 << endl;
    cout << "Time3: " << t3 << endl;

    t4 = t1 + t2;
    cout << "Time4: " << t4 << endl;

    t1 = t3 - t4;
    cout << "Time1: " << t1 << endl;



    if (t1 < t3)
    {
        cout << "Time1 < Time3" << endl;
    }
    else
    {
        cout << "Time3 >= Time1" << endl;
    }

    Time t5 = t2 + Time(0,0,1);
    if (t5 < t2)
    {
        cout << "Time5 < Time2" << endl;
    }
    else
    {
        cout << "Time5 >= Time2" << endl;
    }

//    cout << "Almost midnight: " << Time(0,0,0) - Time(0,0,1) << endl;

    return 0;
}
void Time :: normalize()
    {
        int s = seconds;
        int m = minutes;
        int h = hours;

        while(s < 0)
        {
            s += 60;
            m--;
        }

        while(m < 0)
        {
            m += 60;
            h--;
        }

        while(h < 0)
        {
            h = h + 24;
        }

        seconds = s % 60;
        minutes = (m + s/60) % 60;
        hours   = (h + m/60 + s/3600) % 24;


    }


/*
Example:
0 0 14655
0 104 323
1 1 1
output:
Time1: 04:04:15
Time2: 01:49:23
Time3: 01:01:01
Time4: 05:53:38
Time1: 19:07:23
Time3 >= Time1
Time5 >= Time2
Almost midnight: 23:59:59
*/