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 journeyed to the bathroom. Fact 2- Mary travelled to the hallway. Question: Where is Mary? Answer: hallway
[A]: Fact 2


[Q]: Passage: Fact 1- Mary travelled to the kitchen. Fact 2- Sandra moved to the office. Fact 3- Mary went back to the bedroom. Fact 4- Mary journeyed to the kitchen. Question: Where is Mary? Answer: kitchen
[A]: Fact 4


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