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

int main()
{
  vector<string> vowels = {"a", "e", "i", "o", "u"};

  cout << "vowels: [" << vowels[0];
  for (int i = 1; i < vowels.size(); i++)
  {
    cout << ", " << vowels[i];
  }
  cout << "]" << endl;

  return 0;
}