C :

#include<stdio.h>
int main(){
	int n;
	scanf("%d", &n);
	for(int i=1;i<=n;i++)
	{
		for(int j=i;j<=n;j++)
		{
			int k=n-i-j;
			if(i%2==0)
			{
				if(j%2==0)
				{
					if(k%2==0)
					{
						if(k>=j)
						{
							if(i>0)
							{
								if(j>0)
								{
									if(k>0)
										printf("%d %d %d\n", i, j, k);
								}
							}
						}
					}
				}
			}
					
		}
	}
}

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))