Hasta La Motion!

Ok, my scene is set. I have 70 write nodes, each of them connecting to an image sequence. They all have the file destination and filne name set and they work fine when i try to render them alone. But I would like to render them all at once, is it possible?

When I try to render them all, Nuke asks me for the frame range, the problem is I have clips with 30 frames and clips with 300 frames.

What can I do to render all my Write Nodes using the frame range of the Read Node that they are connected to?

Here is what I tried but didn´t work (maybe cause the expression is wrong):

But I get the Result: ERROR

Thanks all !