#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
	int h,m,s;

	cin >> h;
	cin >> m;
	cin >> s;

	s++;

	if(s == 60)
	{
		s = 0;
		m++;
	}
	if(m == 60)
	{
		m = 0;
		h++;
	}
	if(h == 24)
	{
		h = 0;
	}

	cout << setw(2) << setfill('0') << h << ":";
	cout << setw(2) << setfill('0') << m << ":";
	cout << setw(2) << setfill('0') << s << endl;

	return 0;
}