Quality Assurance Sudoku Solver.Match html text field value to table and table value to text field

Could someone please assist me in the following issue.
The user storie states that.
2.When a valid number is entered in the text area, the same number is applied to the correct cell of the sudoku grid.
4. When a valid number is entered in the sudoku grid, the same number appears in the correct position in the text area.
How is it possible to change a value from html text field that changes the same value at same index in the html table and user input change value from html table to html text field?
I know one could get element value by document.getElementById().value or for every table class use document.querySelectorAll()
Please asvise how to do step 2 and 4 of user stories.

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