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.

Example Input: Passage: Fact 1- Sandra moved to the office. Fact 2- John went to the kitchen. Fact 3- John travelled to the garden. Fact 4- Mary moved to the office. Question: Where is Mary? Answer: office
Example Output: Fact 4

Example Input: Passage: Fact 1- John went to the office. Fact 2- Mary journeyed to the garden. Fact 3- John went to the garden. Fact 4- John journeyed to the hallway. Question: Where is John? Answer: hallway
Example Output: Fact 4

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