#include <bits/stdc++.h>
using namespace std;

int main() {
	int n = 0, t, s, v;
	cin >> s >> v;
	if (s % v == 0)
		t = s / v + 10;
	if (s % v != 0)
		t = s / v + 11;
	for (n = 0; n <= 7; n++) {

		if (t >= n * 60 + 1 && t <= n * 60 + 50)
			printf("0%d:%d", 7 - n, 60 - t + 60 * n);
		if (t > n * 60 + 50 && t <= n * 60 + 60)
			printf("0%d:0%d", 7 - n, 60 - t + 60 * n);
	}
	for (n = 8; n <= 23; n++) {

		if (t >= n * 60 + 1 && t <= n * 60 + 50)
			printf("%d:%d", 23 - n, 60 - t + 60 * n);
		if (t > n * 60 + 50 && t <= n * 60 + 60)
			printf("0%d:0%d", 23 - n, 60 - t + 60 * n);
	}
	return 0;

}