Find element sequence in list

[eness.gun]

Hello,
I would like to find element sequence which is null.
Could you please help me about that this topic.
I am working to say Output should give me 340-330 etc.

[Draxl_Andreas]

@eness.gun ,

you can try this

or a workaround

[eness.gun]

I have tried that but it is not benefical for me.
I would like to get sequence of list element.

[robert12546358]

You can Try this.