Index of elements

Hello !
I wish to obtain index of elements of the List B in List A. it seems that the List.IndexOf node is not appropriate in this case (or just me not able to use it well). It stops at the first element in a sublist of the list A.
To be clear, elements 12 and 15 of the List B should be found in the “3 List” position in the List A and I would expect have them in the list C at the position 3 indexes (0 and 3).
Does anyone met this problem before? Can you help me?
Thank you !

List.AllIndiciesOf is the node you’re after. Be sure to set the “element” input to @L1 so that it iterates over the list of elements.

1 Like

Thank you ! It worked !