如何从以值为数组的散列中获取值?

I have a hash:

我有一个散列:

a = {
  "person" => [
    {
      "age"     => ["0"],
      "details" => [
        {
          "hobby"    => ["6"],
          "interest" => ["programming"]
        }
      ]
    }
  ]
}
a = {
  "person" =>