is there any way to sum the number of elements in a data tree,

I have a data tree with three lists, where many rows are empty but some of them contain points, and I need to know how many elements in total has each row… each index correspondingly. …Regardless in which list it belongs too, I need to know the number in total, So as a result I need a list with the summed up list length of three lists.

The length of the output should be the same, and I need to have numbers only…( 0 - if there is no element in that position in any of the lists, or 1,2 depending on the number of the elements)

Many thanks in advance

ListLengthOutofDataTree.gh (333.6 KB)