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

### Instruction:
What is the sum of Blks, when Stls is 1, and when Rebs is greater than 8.6?

### Inputs:
table_name: table, columns: ['Year', 'Rebs', 'Asts', 'Stls', 'Blks']

### Response:
SELECT SUM Blks FROM table WHERE Stls = 1 AND Rebs > 8.6