#include <iostream>

    using namespace std;
int recursia()
{
    int k;
        cin >> k;
    if(k == 0) { return 0; } else {
        if(k & 1) {
            cout << k << "/n";
            return (k, recursia());

        }
    }

}

int main()
{
    recursia();
    return 0;
}