'Solution'

app/main.py

@@ -1 +1,46 @@
-# write your code here
+from __future__ import annotations
+from typing import Union
+
+
+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 __str__(self) -> str:
+
+        return (f"Name: {self.name}, "
+                f"Health: {self.health}, "
+                f"Hidden: {self.hidden}")
+
+    def __repr__(self) -> str:
+
+        return f"{{{self}}}"
+
+
+class Herbivore(Animal):
+
+    def hide(self) -> None:
+        if not self.hidden:
+            self.hidden = True
+            return
+        self.hidden = False
+
+
+class Carnivore(Animal):
+
+    @staticmethod
+    def bite(other: Union[Carnivore, Herbivore]) -> Union[str, None]:
+        if isinstance(other, Carnivore):
+            return "Carnivore won't bit Carnivore"
+        if isinstance(other, Herbivore):
+            if other.hidden:
+                return "Carnivore won't be able to bite hidden Herbivore"
+            if other.health > 0:
+                other.health -= 50
+            if other.health <= 0:
+                Animal.alive.pop(Animal.alive.index(other))