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

### Instruction:
What is the IHSAA class of the school with less than 400 students and a mascot of the Tigers?

### Inputs:
table_name: table, columns: ['School', 'Location', 'Mascot', 'Size', 'IHSAA Class', 'IHSAA Football Class', 'County']

### Response:
SELECT IHSAA Class FROM table WHERE Size < 400 AND Mascot = tigers