Serial port Unicode error, String comparison ,SD card parsing

Using Arduino Interfacing w/ Software on the Computer
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Hello,I am working on a project in which I need to read a value from the Serial port and compare each character of it one by one with every character of a .txt file I have stored in my SD card to find the match and return the numbers next to it. It is simple and I wrote the code but have issues because the language is in Greek and the Serial port shows reverse question marks while cannot find the result.The program was working in a previous version of IDE but not anymore.Can anyone help please?

database UNICODE.txt (2.96 KB)

sketch_may02a.ino (1.54 KB)

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Can anyone help please?

With what? The Serial Monitor application expects ASCII data - characters in the range -128 to 127. Your Greek characters are not in that range.

Use a better serial application, such as RealTerm, PuTTY, etc.