No no 
I'm saying I do not see that prefix being applied by your Blocks - so how is it there?
no, the file i send to you is the one on which i want to work, not the one of my exercice
That’s not what I requested 
Let me put some code together to see what I can do.
ok. I am exporting txt file both ways : append and my previous way with \n
Let’s see the difference …
thank you for your help !
using the split block …
I try !
You could just try my .aia for now.
it is ok on my phone too.
The the use of split block at /n seems to be ok
thank you a lot
i 've been using A2P for only 1 week, so i am not very efficient !
You are doing very well.
Lots of hints, tips and sample code on my website
https://www.professorcad.co.uk/appinventor
OK, I’ll have a look at it for sure !
I am doing a little app for my sport club in order top setup list of people attending ski lessons
when it’ll be ok, i can give you the aia …
Hello !
Back to work : I have my solution ( see below ). Quite easy , I just don’t have had enougth time to get all the possibilities of App Inventor
Result :
