Detailed Instructions: 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.
Q: Passage: Fact 1- Sandra went back to the bedroom. Fact 2- Mary went back to the hallway. Fact 3- Mary moved to the bathroom. Fact 4- Mary went to the hallway. Fact 5- Daniel travelled to the bathroom. Fact 6- Sandra went back to the office. Fact 7- Mary moved to the kitchen. Fact 8- John journeyed to the bathroom. Fact 9- Mary moved to the bathroom. Fact 10- Sandra went back to the kitchen. Question: Where is Mary? Answer: bathroom
A:
Fact 9