C++ :

#include <iostream>
using namespace std;
int main()
{
	int n ,i,j,k;
	cin>>n;
	for(i = 2; i < n; i++)
	{
		for(j = 2; j < n - i; j++)
		{
			k = n - i - j;
			if(i + j + k == n && i % 2 == 0 && j % 2 == 0 && k % 2 == 0 && i <= j && j <= k)
			{
				cout<<i<<" "<<j<<" "<<k<<endl;
			}
		}
	}
	return 0;
}

Python :

n = int(input())
for i in range(1, n + 1):
    for j in range(1, n + 1):
        for k in range(1, n + 1):
            if i + j + k == n and i % 2 == 0 and j % 2 == 0 and k % 2 == 0 and i <= j <= k:
                print(str(i) + ' ' + str(j) + ' ' + str(k))