Toggle between coordinates & last input

How do I get the last input to come up when pressing the up arrow key?  Say I'm drawing a line & input @10,10.  When I press the up arrow, the coordinates come up.  How do I get @10,10 to come up?  I've changed it before, but I can't remember how & I can't think of what to search for.

Thanks.

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Image may be NSFW.
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