How do I flash shapes instead of colors like simon says?

I hope i can explain this right.

I have the four basic shapes: square, circle, triangle, rectangle permanently shown on the lower part of the screen. On the top part of the screen these shapes will be randomly "flashed" and then the player will have to REMEMBER their sequence and then touch the corresponding shapes in sequence.

So my question is, would this work in the same way as the simon says games work? Or does there need to be some other events created since the player input would always be on screen in a different area than the symbols being flashed on screen?

Thanks for any input.

I think it could work in exactly the same way as far as I can tell - there's a video tutorial here for a simon says game in construct, it should be fairly simple to modify that to shapes instead of colours