#include <iostream>
#include <vector>

using namespace std;

int main() {


    vector<int>data{1,3,5,7,9};

    cout << "Data[data.size()] is " << endl;
    cout << endl;
    cout << data[data.size()] << endl;
    cout << endl;
    cout << "Data.at(data.size()) is " << endl;
    cout << endl;
    cout << data.at(data.size()) << endl;
    cout << endl;


    return 0;
}