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

### Instruction:
what is the total sack for mike green when fumr is less than 0?

### Inputs:
table_name: table, columns: ['Player', 'Tackles', 'Asst.', 'TotalTK', 'Sack', 'Yards', 'FumR']

### Response:
SELECT SUM Sack FROM table WHERE Player = mike green AND FumR < 0