说明：  建立一个链表，每个结点包括：学号、姓名、性别、年龄。输入一个年龄，如果链表中的结点所包含的年龄等于此年龄，则将此结点删去。
(The establishment of a linked list, each node including: student number, name, gender, age. Enter an age, if the list contains the node age, this age, this node is deleted.)