Table:
Stem	Leaf

4	4, 7

5	0, 1, 9, 9

6	1, 4, 5, 7, 8

7	0, 7

8	1, 4, 8

9	0

Tell me how many rows and columns exist in the given table. Output the final answer as JSON in the format {"row_number": "m", "column_number": "n"}.

There are 8 rows and 2 columns in the table. So, the final answer is {"row_number": "8", "column_number": "2"}.