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I don't know how to include lower case a-z or upper case A-Z in a if else statements

thanks in advance.

If oneChar between 'a' ... 'z' or 'A' ... 'Z', then returns
// true, else, returns...

This is what I have got so far, some sections are missing and I need help with this so anyone can help. It looks simply but I can't figure it out.

Thank you kindly for any help


I am...