4(1)

#include<bits/stdc++.h>
using namespace std;
struct node
{
    char data;
    int fre;
    struct node *next;
};


struct node *head=NULL,*temp,*s;


void display()
{
    temp=head;
    while(temp!=NULL)
    {
        cout<<temp->data<<" "<<temp->fre<<endl;
        temp=temp->next;
    }
}


int main()
{
    int n,i;
    char alpha='a';

    for(i=1; i<=26; i++)
    {
        struct node *newnode;
        newnode=(struct node*) malloc (sizeof(struct node));
        newnode->data=alpha;
        newnode->fre=0;
        newnode->next=NULL;

            if(head==NULL)
            {
                head=newnode;
                s=head;
            }

            else
            {
                s->next=newnode;
                s=newnode;
            }
            alpha++;

    }

    display();

    return 0;

}