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

int main(int argc, const char * argv[]) {
    LL N; cin >> N;
    
    LL top = 0; LL bottom = 0;
    for(LL i = 1; i <= N/2; i++) {
        top = i; bottom = N - i;
        double res1 = log2(top) - (LL)(log2(top));
        double res2 = log2(bottom) - (LL)(log2(bottom));
        if (res1 != 0 && res2 != 0) {
            cout << top << " " << bottom << endl;
            return 0;
        }
    }
    cout << "-1" << endl;

    return 0;
}