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

### Instruction:
Which IHSAA Football Class has a County of 77 sullivan, and a School of union dugger?

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

### Response:
SELECT IHSAA Football Class FROM table WHERE County = 77 sullivan AND School = union dugger