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

### Instruction:
what is the prod.code of the episode with original air date 01/12/1968?

### Inputs:
table_name: table, columns: ['#', 'Title', 'Director', 'Writer(s)', 'Originalairdate', 'Repeatairdate(s)', 'Prod.Code']

### Response:
SELECT COUNT Prod.Code FROM table WHERE Originalairdate = 01/12/1968