diff --git a/app/main.py b/app/main.py
index fa56336e..1741b1b7 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1 +1,39 @@
-# 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 __repr__(self) -> str:
+        return f"" \
+               f"{{Name: {self.name}," \
+               f" Health: {self.health}," \
+               f" Hidden: {self.hidden}" \
+               f"}}"
+
+
+class Herbivore(Animal):
+    def hide(self) -> None:
+        if not self.hidden:
+            self.hidden = True
+        else:
+            self.hidden = False
+
+
+class Carnivore(Animal):
+    @staticmethod
+    def bite(target: Animal) -> None:
+        if isinstance(target, Carnivore) or target.hidden:
+            pass
+        else:
+            target.health -= 50
+            if target.health <= 0:
+                Animal.alive.remove(target)