text: function solve() {
  	class Post {
  		constructor(title, content) {
  			this.title = title;
  			this.content = content;
  		}
  		
  		toString() {
  			return `Post: ${this.title}\nContent: ${this.content}\n`;
  		}
  	}
  	
  	class SocialMediaPost extends Post {
  		constructor(title, content, postLikes, postDislikes) {
  			super(title, content);
  			this.postLikes = postLikes;
  			this.postDislikes = postDislikes;
  			this.comments = [];
  		}
  		
  		addComment(comment) {
  			this.comments.push(comment);
  		}
  		
  		toString() {
  			let result = super.toString();
  			result += `Rating: ${this.postLikes - this.postDislikes}`;
  			if (this.comments.length > 0) {
  				result += `\nComments:\n`;
  				for (let comment of this.comments) {
  					result += ` * ${comment}\n`;
  				}
  			}
  			return result.trim();
  		}
  	}
  	
  	class BlogPost extends Post {
  		constructor(title, content, postViews) {
  			super(title, content);
  			this.postViews = postViews;
  		}
  		
  		view() {
  			this.postViews += 1;
  			return this;
  		}
  		
  		toString() {
  			let result = super.toString();
  			result += `Views: ${this.postViews}\n`;
  			return result.trim();
  		}
  	}
  	
  	return {Post, SocialMediaPost, BlogPost};
  }