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

struct node {
    struct node *next;
    int          data;
};


// first_prime should return the first prime number in the given linked list
int first_prime(struct node *head) {
    // PUT YOUR CODE HERE, DON'T FORGET TO CHANGE THE RETURN!
    return 42;
}


////////////////////////////////////////////////////////////////////////
//               DO NOT CHANGE THE CODE BELOW                         //
////////////////////////////////////////////////////////////////////////

int first_prime(struct node *head);
struct node *strings_to_list(int len, char *strings[]);

// DO NOT CHANGE THIS MAIN FUNCTION
int main(int argc, char *argv[]) {
    // create linked list from command line arguments
    struct node *head = strings_to_list(argc - 1, &argv[1]);

    // If you're getting an error here,
    // you have returned an uninitialized value
    printf("%d\n", first_prime(head));
    
    return 0;
}

// DO NOT CHANGE THIS FUNCTION
// create linked list from array of strings
struct node *strings_to_list(int len, char *strings[]) {
    struct node *head = NULL;
    for (int i = len - 1; i >= 0; i = i - 1) {
        struct node *n = malloc(sizeof (struct node));
        assert(n != NULL);
        n->next = head;
        n->data = atoi(strings[i]);
        head = n;
    }
    return head;
}