#include <iostream>
#include <vector>
using namespace std;
int main() {
    vector<int> v = {1,2,3,4,5};
    v.insert(v.begin() + 2, 10);
    v.erase(v.begin() + 1);
    for (int num : v) {
        cout << num << " ";
    }
    return 0;
}