// A class of times -- encapsulation

#include <iostream>
using namespace std;

class Time
{
    friend void read(Time& t, istream& in);
    friend void print(const Time& t, ostream& out);

private:
    int hours;
    int minutes;
};

void read(Time& t, istream& in = cin)
{
    in >> t.hours;
    in.ignore(); // colon
    in >> t.minutes;
}

void print(const Time& t, ostream& out = cout)
{
    out << t.hours << ':';
    if (t.minutes < 10) {
        out << 0;
    }
    out << t.minutes;
}

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

    read(t);
    print(t);

    return 0;
}