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.

Passage: Fact 1- John went back to the hallway. Fact 2- Daniel journeyed to the bedroom. Fact 3- Sandra went back to the bedroom. Fact 4- Sandra moved to the bathroom. Fact 5- John went to the office. Fact 6- John travelled to the garden. Fact 7- John went to the bedroom. Fact 8- Mary went back to the kitchen. Question: Where is Sandra? Answer: bathroom
Fact 4