#include 
     
      using namespace std;struct Node{    Node *next;    int elem;};void creatList(Node* &head){    head = new Node;    int elem;    cin>>elem;    head->elem = elem;    Node *p = head;    while(cin>>elem&&elem)    {        Node *q = new Node;        q->elem = elem;        p->next = q;        p = p->next;    }    p->next = NULL;}void printList(Node* &head){    cout<
      
       elem<<" ";    Node *p = head->next;    while(p)    {        cout<
       
        elem<<" ";        p = p->next;    }    cout<
        
         elem == x)    {        p = head;        head = head->next;        free(p);        removeX(head, x);    }    else        removeX(head->next, x);}int main(){    Node *p;    creatList(p);    printList(p);    removeX(p, 4);    printList(p);    return 0;}