#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b;
    cin >> a >> b;
		if(a % b != 0)
		{
			int n = a / b / 60;
			cout <<0<<8 - n - 1<<":"<<60 - 10 -(a / b - 60 * n)-1;
		}
		else{
			 int n = a / b / 60;
			cout <<0<<8 - n - 1<<":"<<60 - 10 -(a / b - 60 * n);
		}
    return 0;
}