How do I for each sprite set a new variable?

After deleting one of the tasks I wanted to put a new ID in the variable of each object, following the position order on the Y axis from the highest to the lowest, how to do this?

(Left IDs wrong after destroy the object | Right Correct IDs i want)

You can use "loopindex" expression in all loops.

For example:

for each Sprite -> sprite Set ID to loopindex

If you have 5 sprite instances, this will set their ID variable to numbers from 0 to 4.