C# - pick characters in a string list and convert it to a new string

Grasshopper Developer
1

Hello there,
I have a list of strings in lines which I want to pick the first letter of each string and convert it to one string.
what I do is that I copy the main list to a panel with multiline data like this:
F=AB
A=–x+x
B=y

and then I take the [index 0] and receive another list of strings like:
F
A
B
I am not sure if it is a list… it behaves like multiple items and Later I cannot Join them to one string.
Also if I give the first latters manually (List Item), when I Join them (string.Join), it returns this:

FAB
FAB
FAB

and repeats the string three times. I don’t understand why. I don’t understand if the input list behaves like a List or an Array or something else…
is there a good way to pick some characters in a list of string and join them as one string?

2

Without code it’s basically impossible to help…

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