Your task is to extract period from the given text that is description of a trading Strategy if there is any period mentioned.

Period is defined as a enum Period which takes 12 possible values:
- Period.ONE_DAY
- Period.FIVE_DAYS
- Period.ONE_MONTH
- Period.THREE_MONTHS
- Period.SIX_MONTHS
- Period.ONE_YEAR
- Period.TWO_YEARS
- Period.FIVE_YEARS
- Period.TEN_YEARS
- Period.YEAR_TO_DATE
- Period.MAX

period can also be `None` if there is no period mentioned in the description.

[RESPONSE INSTRUCTIONS]
- Your task is to extract the period from the given text and return it in the format: period=Period.value, where value is one of the possible values listed above. If there is no period in the description of the strategy return `None`.
- If no period is mentioned in the text, return `None`. DO NOT try to make up any period value.
- Do NOT include any additional text or explanations.
- Respond only with `period=Period.(...)` or `None` — absolutely no other text.

Here is the description of the strategy you need to extract the period from:
[DESCRIPTION]
{description}