In Japanese, graphemes include hiragana, katakana, kanji, etc.

His handwriting is very beautiful.

He is studying Japanese.

He practices kanji every day.

This sentence contains many words written in katakana.

She is beautiful in her unadorned state.

My house is located in one section of this village.

'素' is one of the basic characters in Japanese.

I am interested in Japanese language education.

How many letters are in this sentence?