#define _CRT_SECURE_NO_WARNINGS
#include "stdlib.h"
#include "stdio.h"

struct Node {
    int data;
    struct Node* next;
    struct Node* prev;
};

struct Node* head;

struct Node *newNode(int x) {
struct Node* temp = malloc(sizeof(struct Node));
    temp->data = x;
    temp->prev = NULL;
    temp->next = NULL;
    return temp;
}


void InsertAtHead(int x) {
    struct Node* temp = newNode(x);
    if (head == NULL) {
        head = temp;
        return;
    }
    else {
        head->prev = temp;
        temp->next = head;
        head = temp;
    }
}

void Print() {
        struct Node* temp = head;
        while (temp != NULL) {
            printf("%d", temp->data);
            temp = temp->next;
        }
        printf("\n");

}

int main() {
    head = NULL;
    InsertAtHead(2);
    InsertAtHead(3);
    InsertAtHead(4);
    InsertAtHead(5);
    InsertAtHead(6);
    InsertAtHead(7);
    Print();
}