Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Altitude (mslm) has a Density (inhabitants/km 2) smaller than 1233, and a Rank of 9th?

### Inputs:
table_name: table, columns: ['Rank', 'Common of', 'Population', 'Area (km 2 )', 'Density (inhabitants/km 2 )', 'Altitude (mslm)']

### Response:
SELECT SUM Altitude (mslm) FROM table WHERE Density (inhabitants/km 2 ) < 1233 AND Rank = 9th