diff --git a/app/main.py b/app/main.py
index fa56336e..09201858 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1 +1,36 @@
-# write your code here
+class Animal:
+    alive = []
+    default_health = 100
+
+    def __init__(self, name: str, health: int = None) -> None:
+        self.name = name
+        self.health = health if health is not None else self.default_health
+        self.hidden = False
+        Animal.alive.append(self)
+
+    def __str__(self) -> str:
+        return f"{{Name: {self.name}, Health: {self.health}, Hidden: {self.hidden}}}"
+
+
+class Carnivore(Animal):
+    def check_is_alive(self, animal: Animal) -> None:
+        if animal.health <= 0:
+            super().alive.remove(animal)
+
+    def bite(self, animal: Animal) -> None:
+        print(animal.hidden)
+        print(isinstance(animal, Herbivore) and not animal.hidden)
+        if isinstance(animal, Herbivore) and not animal.hidden:
+            print('bam')
+            animal.health -= 50
+            self.check_is_alive(animal)
+
+
+class Herbivore(Animal):
+    def hide(self) -> None:
+        self.hidden = not self.hidden
+
+
+lion = Animal("Lion King")
+print(lion)
+print(Animal.alive)