Solution

app/main.py

@@ -1 +1,26 @@
-# write your code here
+class Animal:
+    alive = []
+
+    def __init__(self, name: str, health: int = 100) -> None:
+        self.name = name
+        self.health = health
+        self.hidden = False
+        Animal.alive.append(self)
+
+    def __repr__(self) -> str:
+        return "{" + f"Name: {self.name}, " \
+                     f"Health: {self.health}, " \
+                     f"Hidden: {self.hidden}" + "}"
+
+
+class Herbivore(Animal):
+    def hide(self) -> None:
+        self.hidden = not self.hidden
+
+
+class Carnivore(Animal):
+    def bite(self, herbivore: Herbivore) -> None:
+        if isinstance(herbivore, Herbivore):
+            herbivore.health -= 50 if not herbivore.hidden else 0
+            if herbivore.health <= 0:
+                super().alive.remove(herbivore)