编写一个程序，实现单链表的各种基本运算，并在此基础上设计一个主程序完成如下功能：

（1）初始化单链表

（2）依次采用尾插法插入a,b,c,d,e元素

（3）输出单链表

（4）在第四个元素位置上插入f元素

（5）删除该单链表的第三个元素

-Write a program to achieve the basic operations of single linked list, and designed on the basis of a main program performs the following functions: (1) initialize a singly linked list (2) followed by end plug into your a, b, c, d e element (3) output a single linked list (4) inserted in the fourth element position f elements (5) delete the third element in the single linked list