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

### Instruction:
What is the lowest official ITV1 rating with 45.4% share?

### Inputs:
table_name: table, columns: ['Episode', 'Air date', 'Official ITV1 rating', 'Weekly rank', 'Share']

### Response:
SELECT MIN Official ITV1 rating FROM table WHERE Share = 45.4%