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

### Instruction:
On what week were there 26,243 in attendance on September 21, 1969?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']

### Response:
SELECT COUNT Week FROM table WHERE Date = september 21, 1969 AND Attendance < 26,243