#include <iostream>
#include <string>
#include <cctype>

using namespace std;


struct Node {
    string title;
    Node* next;
};
Node* newNode(const string& title) {
    Node* node = new Node;
    node->title = title;
    node->next = nullptr;
    return node;
bool isValidTitle(const string& title) {
    for (char ch : title) {
        if (isdigit(ch)) {
            return false;
        }
    }
    return true