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

### Instruction:
what is the total sack when totaltk is 1 and asst. is more than 0?

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

### Response:
SELECT SUM Sack FROM table WHERE TotalTK = 1 AND Asst. > 0