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


[Q]: Passage: Fact 1- John journeyed to the bedroom. Fact 2- Daniel moved to the office. Fact 3- John went to the hallway. Fact 4- John journeyed to the kitchen. Question: Where is John? Answer: kitchen
[A]: Fact 4


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