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: "At the start of the journey, there were 7 people in the elevator. After the
  second floor, there were 7 - 3 + 2 = 6 \npeople. After the fourth floor, there were
  6 - 5 + 2 = 3 people. After the seventh floor, there were 3 - 1 + 3 = 5 \npeople.
  Finally, after the tenth floor, there were 5 - 5 = 0 people remaining. So, in total,
  7 (at the first floor) + 6\n(at the third floor) + 5 (at the sixth floor) + 3 (at
  the eighth floor) + 1 (at the ninth floor) = 22 people exited the\nelevator during
  the journey.\n\nTherefore, the answer is: 22 people exited the elevator during the
  journey, and there were 0 people in the elevator at \nthe end of the journey."