One character in one cell

how to write a word but the input be one letter in a cell and the cursor moves automatically into the next cell

Manually.
Letter key - Arrow key - Letter key - Arrow key - Letter key - Arrow key - …

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How about typing the word into a cell and using a formula to separate the letters out?
OneLetterPerCell.ods (11.0 KB)

If you need the letters pasted elsewhere use Paste Special and paste as unformatted text.

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Text to Columns - Fixed width:
imagen

Find and Replace in Writer:
imagen