APEX

Hi all, I hope someone can help me on this simple problem. I would like to create a simple page which will retrieve a value from another page via URL. So far I have no luck to retrieve it.

So on my first page, I have a report with the ID column's type set to link. If clicked, the app will redirect to the second page by passing the ID's value:

The value is passed in the URL (e.g. https://apex.oraclecorp.com/pls/apex/f?p=29971:3:6650060513775::NO:RP:Account_ID:1), but I could not retrieve it when I tried to build a classic report via SQL:

SELECT
    *
FROM
    AccountSupport_Account a
WHERE
    a.ID = :Account_ID

Whenever I click the link to that page, it always throw error: Unable to find item ID for item "ACCOUNT_ID" in application

Any help will be appreciated! I am using Apex 5.0 btw.