Displaying a Button After Learner Types in Text Box

Hi there-

I am hoping someone can offer a possible solution to an interaction I am trying to create.  I want learners to type in a text box and then after they type in the text box, a submit button to appear (initial state is set to hidden). I know about the "control loses focus" function, but that does not really suit what I am trying to do here. I want the submit button to appear once they have typed anything into the text box.  Unfortunately, "control loses focus" only functions if they click outside of the text box first.

I do not have my submit button initially visible on the slide so learners would not know to click on the slide for something to happen.

I have attached my slide for reference. Any suggestions would be appreciated! 

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