3)LINKED LIST : Inserting and deleting first element of linked list in c++

#include<iostream>
using namespace std;
struct node
{
    int data;
    node* address;
};
struct node* head;
void insert(int element)
{
    node* block = new node();
    block ->data = element;
    block ->address = head;
    head = block;
}
void remove()
{
    node* block = head;
    head = head ->address;
    free(block);
}
void print()
{
    node* block = head;
    cout<<"List is : ";
    while (block != NULL)
    {
        cout<<block ->data;
        block = block ->address;
        cout<<" ";
    }
    cout<<"\n";
    
}
int main()
{
    head = NULL;
    cout<<"How many elements : ";
    int size , element , cut;
    char id;
    cin>>size;
    for(int i=0 ; i<size ; i++)
    {
        cout<<"Enter the element : ";
        cin>>element;
        insert(element);
        print();
        if(i==size-1)
        {
            cout<<"Do you want to insert or delete the element (Lowercase : i/d) :";
            cin>>id;
            if(id==105)
            {
                size=size+1;
                cout<<"Enter the element : ";
                cin>>element;
                insert(element);
                print();
            }
            else if (id==100)
            {
                cout<<"How many elements do you want to remove : ";
                cin>>cut;
                if(cut>=size)
                {
                    cout<<"Deletion not possible .";
                }
                else
                {
                    for(int i=0 ; i<cut ; i++)
                    {
                    remove();
                    }
                    print();
                }
            }
            else
            {
                cout<<"Wrong input ";
                exit;
            }
            
            
        }
    }
}