#include <iostream>
#include <iomanip>

using std::cin;
using std::cout;
using std::setw;

struct time
{
	int hour, min, sec;
	time(int h, int m, int s) { hour = h; min = m; sec = s; }
	time() { hour = 0; min = 0; sec = 0; }
	friend std::ostream& operator << (std::ostream& out, const time& thetime)
	{
		char old = out.fill();
		out.fill('0');
		out << setw(2) << thetime.hour << ':' << setw(2) << thetime.min << ':' << setw(2) << thetime.sec;
		out.fill(old);
		return out;
	}
};

typedef struct time t;

t getTime();
t addTime(const t,const t);
void printTime(const t);

int main()
{
	t first, second, result;
	char trash;
	for(;;)
	{
		first = getTime();
		cin >> trash;
		if (cin.fail())
			return 0;
		second = getTime();
		result = addTime(first, second);
		std::cout << first << '+' << second << '=' << result << '\n';
	}
}

t getTime()
{
	//##:##:##
	t out;
	char junk;
	cin >> out.hour >> junk >> out.min >> junk >> out.sec;
	return out;
}

t addTime(const t first,const t second)
{
	t result;
	result.sec = first.sec + second.sec;
	result.min = first.min + second.min;
	result.hour = first.hour + second.hour;
	if (result.sec > 59)
	{
		result.min++;
		result.sec -= 60;
	}
	if (result.min > 59)
	{
		result.hour++;
		result.min -= 60;
	}
	if (result.hour > 23)
		result.hour -= 24;
	return result;
}

void printTime(const t thetime)
{
	cout.fill('0');
	cout << setw(2) << thetime.hour << ':' << setw(2) << thetime.min << ':' << thetime.sec;
}