I need some help to find a correct formula

Hello,
I am a beginner in Excel, I can work with some formulas like, LEN, Char, If,...
I stumbled upon a problem and I do not know how to start or what formula to use.
I manually filled in "A" to show how it should be if I would use a formula.


Excelfunction.PNG

=if(isnumber(b2),b2,a1) perhaps in a2

Thank you!
This works like a charm!
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