Your answer is: Will
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Here's a bad Visual maybe this could help for further explaining; I is Amber
she moves back 3 places 3 times
I--------
Then she is invited to move up 5
----I----
Will moved back 4 places twice, so now we're going to add a / representing where Amber once stood- the full line that we are given;
-/I-------
Then back up 3
-/--I-----
At the end Amber and Will stood;
---WA----