What was written in the letter at the end of episode 34 of Detective Conan?

Is the landlord talking about the small white characters on this picture?

Is the katakana of Kudou Shinichi: ツソィチ? クドウ

Because this letter was written to him by Xinyi's father; At the end of the letter, Shinichi. K is the name of Kudou Shinichi written in Roman characters;

And the writing of this K is the consistent usage of Kudou Yū saku; So Conan knew that this was written to him by his father more than ten years ago; The subtitle at the end just wrote Kudou Shinichi's katakana to tell the audience that Conan already knew. ...

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