diff --git a/submissions/rukhlovka/oop-exercise/index.js b/submissions/rukhlovka/oop-exercise/index.js
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+import { print } from "./js/lib.js";
+/* Refer to https://github.com/OleksiyRudenko/a-tiny-JS-world for the task details
+   Complete the below for code reviewers" convenience:
+
+   Code repository: _put repo URL here_
+   Web app: _put project"s github pages URL here_
+   */
+
+// ======== OBJECTS DEFINITIONS ========
+// Define your objects here
+
+class Essence {
+   constructor(species, name, gender, legs, saying) {
+      this.species = species;
+      this.name = name;
+      this.gender = gender;
+      this.legs = legs;
+      this.saying = saying;
+      this.attributes = [
+         { attribute: "species", text: "I am a" },
+         { attribute: "name", text: "My name is" },
+         { attribute: "gender", text: "My gender:" },
+         { attribute: "legs", text: "I have legs:" },
+         { attribute: "saying", text: "My favorite phrase: " },
+      ];
+   }
+   showEssenceAttributes() {
+      return this.attributes.map(({ attribute, text }) => `${text} ${this[attribute]}`).join("; ");
+   }
+};
+
+class Human extends Essence {
+   constructor(name, gender, saying, hair) {
+      super("human", name, gender, 2, saying);
+      this.hands = 2;
+      this.hair = hair;
+      this.attributes = [
+         ...this.attributes,
+         { attribute: "hands", text: "I have hands:" },
+         { attribute: "hair", text: "My hair color is:" },
+      ];
+   }
+};
+
+class Man extends Human {
+   constructor(name, saying, hair) {
+      super(name, "male", saying, hair);
+   }
+};
+
+class Woman extends Human {
+   constructor(name, saying, hair) {
+      super(name, "famale", saying, hair);
+   }
+};
+
+class Animal extends Essence {
+   constructor(species, name, gender, saying, fur) {
+      super(species, name, gender, 4, saying);
+      this.fur = fur;
+      this.attributes = [
+         ...this.attributes,
+         { attribute: "fur", text: "The color of my fur is:" },
+      ];
+   }
+};
+class Cat extends Animal {
+   constructor(name, gender, fur) {
+      super("cat", name, gender, "Meaw-meaaaaw", fur);
+   }
+};
+class Dog extends Animal {
+   constructor(name, gender, fur) {
+      super("dog", name, gender, "Gav-gav", fur);
+   }
+};
+
+const entities = [
+   new Woman("Sara", "Hello!", "blond"),
+   new Woman("Lily", "hi", "red"),
+   new Woman("Sara", "Hello everybody", "brown"),
+   new Man("Simon", "Yo-yo", "silver"),
+   new Man("Bill", "I am top", "brown"),
+   new Man("Boris", "Hello everybody", "blond"),
+   new Cat("Tom", "female", "grey"),
+   new Cat("Jerry", "male", "white"),
+   new Dog("Pes Duck", "female", "black and white"),
+   new Dog("Bob", "male", "brown"),
+];
+
+entities.forEach((essence) => {
+   print(essence.showEssenceAttributes());
+});