Given the task definition, example input & output, solve the new input case.
You will be given a passage with an enumerated set of facts, a question of form 'Where is <person_name>?', and its answer. The task is to identify a supporting fact that is necessary to answer the question. The output would be the corresponding fact number.
Example: Passage: Fact 1- Mary moved to the bathroom. Fact 2- John went to the hallway. Question: Where is Mary? Answer: bathroom
Output: Fact 1
Fact 1- 'Mary moved to the bathroom.' is a supporting fact from which we can conclude that Mary is in bathroom therefore the output is- Fact 1.

New input case for you: Passage: Fact 1- Mary went back to the bedroom. Fact 2- Mary moved to the bathroom. Fact 3- Sandra travelled to the bedroom. Fact 4- Sandra went to the office. Question: Where is Sandra? Answer: office
Output:
Fact 4