#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<int> v = {1, 3, 5, 7, 9};
    v.insert(v.begin() + 2, 4);
    v.erase(v.end() - 3);
    for (int num : v) {
        cout << num << " ";
    }
    return 0;
}