Replace items in list A with items in list B where condition is true

Revit
1

If I have two lists of the same length, how can I replace values in list A with the value from list B (at the same index position) where the value in A equals a certain string?

2

Hi here is an example with the remainder of the division (next subject)
if the remainder of the division is equal to 0
I want a number
otherwise I want a letter

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// Test ? action if true : actions if false 
Num%2==0?Num:Let;

cordially
christian.stan

3

That worked great. Thanks!