#include <iostream>
#include <iomanip>

using namespace std;

int main() {
        bool min_max_set = false;
        int min_hour = 0;
        int min_minutes = 0;
        int max_hour = 0;
        int max_minutes = 0;

        for(int i = 0; i < 3; i++) {
                int hour1, hour2, minutes1, minutes2, time;
                cin >> hour1 >> minutes1 >> hour2 >> minutes2;

                int hours_passed = hour2 - hour1;

                if(hours_passed < 0)
                        hours_passed += 24;

                int minutes_passed = minutes2 - minutes1;

                if(minutes_passed < 0)
                        minutes_passed += 60;

                if(min_max_set) {
                        if(hours_passed > max_hour && minutes_passed > max_minutes) {
                                max_hour = hours_passed;
                                max_minutes = minutes_passed;
                        }

                        if(hours_passed < min_hour && minutes_passed > min_minutes) {
                                min_hour = hours_passed;
                                min_minutes = minutes_passed;
                        }
                }
                else {
                        max_hour = hours_passed;
                        max_minutes = minutes_passed;
                        min_hour = hours_passed;
                        min_minutes = minutes_passed;
                        min_max_set = true;
                }
        }

        cout << min_hour << ":" << setw(2) << setfill('0') << min_minutes << endl;
        cout << max_hour << ":" << setw(2) << setfill('0') << max_minutes << endl;

        return 0;
}