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

### Instruction:
what is the total number of tackles when fumr is 0, totaltk is 54 and yards is less than 0?

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

### Response:
SELECT COUNT Tackles FROM table WHERE FumR = 0 AND TotalTK = 54 AND Yards < 0