Six friends sat in a movie theater in a row containing 6 seats, numbered 1 to 6 from left to right. (The directions "left" and "right" are from the point of view of the people as they sit in the seats.) During the movie Alice went to the lobby to get some popcorn. When she returned, she found that Bob had moved two seats to the right, Carol had moved one seat to the left, and David had moved one seat to the right. Emily and Frank had switched seats, leaving an end seat for Alice. In which seat had Alice been sitting before she got up?