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

### Instruction:
How many gains have a long greater than 8, with avg/g of 124.9?

### Inputs:
table_name: table, columns: ['Name', 'Gain', 'Loss', 'Long', 'Avg/G']

### Response:
SELECT SUM Gain FROM table WHERE Long > 8 AND Avg/G = 124.9