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

### Instruction:
when was the building withdrawn when the builder was ac cars and was introduced before 1958?

### Inputs:
table_name: table, columns: ['Number Range', 'Builder', 'Introduced', 'No. Built', 'Region', 'Withdrawn']

### Response:
SELECT SUM Withdrawn FROM table WHERE Builder = ac cars AND Introduced < 1958