Solution

app/main.py

@@ -1,7 +1,10 @@
 class Animal:
     alive = []
 
-    def __init__(self, name: str, health: int = 100, hidden: bool = False) -> None:
+    def __init__(self,
+                 name: str,
+                 health: int = 100,
+                 hidden: bool = False) -> None:
         self.name = name
         self.health = health
         self.hidden = hidden
@@ -12,7 +15,9 @@ def check_alive_animals() -> None:
         Animal.alive = [animal for animal in Animal.alive if animal.health > 0]
 
     def __repr__(self) -> str:
-        return f"{{Name: {self.name}, Health: {self.health}, Hidden: {self.hidden}}}"
+        return (f"{{Name: {self.name},"
+                f"Health: {self.health},"
+                f"Hidden: {self.hidden}}}")
 
 
 class Herbivore(Animal):