input:
  question: A building has 10 floors. At the ground floor, 7 people enter the elevator.
    At the second floor, 3 people get off and 2 people enter. At the fourth floor,
    5 people get off and 2 people enter. At the seventh floor, 1 person gets off and
    3 people enter. Finally, at the tenth floor, everyone remaining in the elevator
    gets off. The question is, How many people were in the elevator when it started
    its journey, and how many total people exited the elevator by the end of its journey?
output: "Let's analyze the situation:\n\n1. At the ground floor, 7 people enter the
  elevator.\n2. By the second floor, 3 people have exited, and 2 new people have entered,
  making a total of 7 - 3 + 2 = 6 \npeople.\n3. By the fourth floor, 5 people have
  exited, and 2 new people have entered, making a total of 6 - 5 + 2 = 4 \npeople.\n4.
  By the seventh floor, 1 person has exited, and 3 new people have entered, making
  a total of 4 - 1 + 3 = 6 \npeople.\n5. Finally, at the tenth floor, all remaining
  6 people exit the elevator.\n\nThus, there were 7 (the initial number of people
  who entered the elevator) - 6 (the total number of people who \nexited the elevator
  by the end of its journey) = 1 person in the elevator when it started its journey.\n\nDuring
  the elevator's journey, a total of 7 (the initial number of people who entered the
  elevator) + 3 (the number\nof people who exited at the second floor) + 5 (the number
  of people who exited at the fourth floor) + 1 (the number\nof people who exited
  at the seventh floor) = 16 people have exited the elevator."