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- Sandra moved to the office. Fact 2- John went back to the garden. Fact 3- Daniel travelled to the office. Fact 4- Sandra journeyed to the bathroom. Fact 5- John moved to the kitchen. Fact 6- John moved to the bathroom. Fact 7- Sandra journeyed to the hallway. Fact 8- Daniel went to the bathroom. Fact 9- Sandra went to the bathroom. Fact 10- Sandra journeyed to the hallway. Question: Where is Sandra? Answer: hallway
Fact 10