What will be the output of the following C++ code?

#include <iostream>
using namespace std;
namespace extra
{
    int i;
}
void i()
{
    using namespace extra;
    int i;
    i = 9;
    cout << i;
}
int main()
{
    enum  letter { i, j};
    class i { letter j; };
    ::i();
    return 0;
}