Sharepoint 2013 - How to lookup custom string in workflow task

I'm creating a workflow that assigns a task to a person. After that person completes the task, they are required to input a string of text (a server URL) before they can press "Approve." Once this is done, I want my workflow to assign the next task to another individual, and in the email notification I want to include the server URL the previous person entered. The problem is I haven't been able to find the correct lookup procedure to reference this server URL.
How do I look-up the VM Server URL from the approval screen?
And how do I include that string in the email that gets sent out as the next task?

Update on 1/15

Following Amal's advice, instead of referencing the Current Item ID, I tried to reference the ID matching the output task ID (picture added below). I changed the ID to reference the Task ID from the previous assigned task and now when I complete the first task it seems like the workflow is unable to progress to the next task. It seems to break the workflow. Is there something I did wrong?
I think part of the issue is that the TaskID variable is a string like this (4250c824-d81d-4d4a-b440-924901a1da95), but SharePoint only let's me retrieve it as an integer.

Solution

The problem was that I was trying to map to the ID field, and apparently that is only for integers. The TaskID is a string and needed to be mapped to the GUID field as a string. This is what worked for me: