为啥这到题不对

#include <iostream>
#include <cmath>
using namespace std;
int main() {
    freopen("power.in", "r", stdin);
    freopen("power.out", "w", stdout);
    long long int n, b, v;
    bool a = false;
    cin >> n;
    for (int i = 2; i < n; i += 2) {
        for (int j = 2; j < n; j += 2) {
            if (j + i == n && j != i) {
                b = i;
                v = j;
                a = true;
                cout << b << " " << v;
                return 0;
            }
        }
    }
    cout << -1;
    return 0;
}