Solution

app/main.py

@@ -1 +1,40 @@
-# write your code here
+class Animal:
+    alive = []
+
+    def __init__(
+            self, name: str,
+            health: int = 100,
+            hidden: bool = False
+    ) -> None:
+        self.name = name
+        self.health = health
+        self.hidden = hidden
+        Animal.alive.append(self)
+
+    def __setattr__(self, attr: str, value: int) -> None:
+        if attr == "health" and value <= 0 and self in Animal.alive:
+            Animal.alive.remove(self)
+        super().__setattr__(attr, value)
+
+    def __repr__(self) -> str:
+        return f"{{"\
+               f"Name: {self.name},"\
+               f"Health: {self.health},"\
+               f"Hidden: {self.hidden}}}"
+
+
+class Herbivore(Animal):
+    def hide(self) -> bool:
+        if self.hidden is False:
+            self.hidden = True
+        else:
+            self.hidden = False
+        return self.hidden
+
+
+class Carnivore(Animal):
+    @staticmethod
+    def bite(other: "Animal") -> int:
+        if isinstance(other, Herbivore) is True and other.hidden is False:
+            other.health -= 50
+        return other.health