现有公园游船租赁处请你编写一个租船管理系统。当游客租船时，管理员输入船号并按下S键，系统开始计时；当游客还船时，管理员输入船号并按下E键，系统结束计时。船号为不超过100的正整数。当管理员将0作为船号输入时，表示一天租船工作结束，系统应输出当天的游客租船次数和
平均租船时间。(Existing park cruise rental office, please write a charter management system. When a tourist ships, the administrator enters the ship number and presses the S key. The system starts clocking. When the visitor is returning the ship, the administrator enters the ship number and presses the E key to end the system. The ship number is a positive integer of no more than 100. When the administrator enters 0 as the ship number, it indicates that the day charter work is finished and the system should output the number of times of passenger charter and the number of days
Mean time to charter.)