1988 students are arranged in a row according to the number from small to large, and the students with odd numbers (1, 3...) leave the team, and the order of the rest of the students remains unchanged. Then let the students who are standing in the odd-numbered positions of the new numbers leave the team. Repeat the above requirements in turn, then what is the number of the last student who is ranked at the beginning.
1988名同学按编号从小到大顺次排成一列，令奇数号位(1号位，3号位…)上的同学离队，余下的同学顺序不变．再令其中站在新编号奇数号位上的同学离队．依次重复上面的要求，那么最后留下的同学在一开始是排在第多少号位．
<result>9</result>