怎么在下面code here那里加代码使得满足下图所示，就是输出输入元素是第几个。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct node {
char word[20];
struct node *next;
} Node;

Node* createList();
int searchWord(Node*, char[]);
void deleteList(Node*);

int main(void) {

char str[20];
int index = 0;
Node *pHead;

pHead = createList();

puts("Please input the word to search");
scanf("%s", str);
index = searchWord(pHead, str);
if(index ==0)
printf("The word %s does not exist\n", str);
else
printf("The %dth word is %s \n", index, str);
deleteList(pHead);

return 0;
}
Node* createList(){
char str[20];
Node *pNode1, *pNode2, *head = NULL;

setbuf(stdout, NULL);
puts("Please input the line of words");

scanf("%s", str);

while (strcmp(str, "End")!=0){
pNode2 =(Node*)malloc(sizeof(Node));
strcpy (pNode2 -> word, str);
if (head == NULL)
head = pNode2;
else
pNode1 -> next = pNode2;
pNode1 = pNode2;
scanf("%s", str);
}
pNode1 -> next = NULL;
return head;
}

int searchWord(Node* head, char str[]){

//Code here

}
void deleteList(Node *head){
Node *pNode1, *pNode2;
pNode1 = head;
while (pNode1 != NULL){
pNode2 = pNode1 -> next;
free(pNode1);
pNode1 = pNode2;
}
return;
}

补充如下，供参考：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct node {
    char word[20];
    struct node* next;
} Node;

Node* createList();
int  searchWord(Node*, char[]);
void deleteList(Node*);

int main(void) 
{
    char str[20];
    int index = 0;
    Node* pHead;

    pHead = createList();

    puts("Please input the word to search");
    scanf("%s", str);
    index = searchWord(pHead, str);
    if (index == 0)
        printf("The word %s does not exist\n", str);
    else
        printf("The %dth word is %s \n", index, str);
    deleteList(pHead);

    return 0;
}
Node* createList() {
    char str[20];
    Node* pNode1, * pNode2, * head = NULL;

    setbuf(stdout, NULL);
    puts("Please input the line of words");

    scanf("%s", str);

    while (strcmp(str, "End") != 0) {
        pNode2 = (Node*)malloc(sizeof(Node));
        strcpy(pNode2->word, str);
        if (head == NULL)
            head = pNode2;
        else
            pNode1->next = pNode2;
        pNode1 = pNode2;
        scanf("%s", str);
    }
    pNode1->next = NULL;
    return head;
}

int searchWord(Node* head, char str[]) {
    //Code here
    int   index = 0;
    Node* pNode1 = head;
    while (pNode1)
    {
        index++;
        if (strcmp(pNode1->word, str) == 0)
            return index;
        pNode1 = pNode1->next;
    }
    if (pNode1 == NULL)
        return 0;
}
void deleteList(Node* head) {
    Node* pNode1, * pNode2;
    pNode1 = head;
    while (pNode1 != NULL) {
        pNode2 = pNode1->next;
        free(pNode1);
        pNode1 = pNode2;
    }
    return;
}