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.

Ex Input:
Passage: Fact 1- Daniel went back to the office. Fact 2- Mary went back to the hallway. Question: Where is Mary? Answer: hallway

Ex Output:
Fact 2


Ex Input:
Passage: Fact 1- Daniel went back to the bedroom. Fact 2- Sandra travelled to the bedroom. Fact 3- Sandra went to the office. Fact 4- Mary went to the office. Question: Where is Mary? Answer: office

Ex Output:
Fact 4


Ex Input:
Passage: Fact 1- Sandra travelled to the office. Fact 2- Sandra travelled to the bathroom. Fact 3- Mary went back to the hallway. Fact 4- Mary travelled to the bathroom. Fact 5- Daniel went to the bedroom. Fact 6- Mary went to the office. Question: Where is Mary? Answer: office

Ex Output:

Fact 6