diff --git a/.flake8 b/.flake8
index d7459204..3f5e06ff 100644
--- a/.flake8
+++ b/.flake8
@@ -4,4 +4,4 @@ ignore = E203, E266, W503, ANN002, ANN003, ANN101, ANN102, ANN401, N807, N818
 max-line-length = 79
 max-complexity = 18
 select = B,C,E,F,W,T4,B9,ANN,Q0,N8,VNE
-exclude = venv, tests
+exclude = venv, tests, .venv
diff --git a/app/main.py b/app/main.py
index 626f41cf..5bd8a411 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,34 +1,64 @@
 class Deck:
-    def __init__(self, row, column, is_alive=True):
-        pass
+    def __init__(self, row: int, column: int, is_alive: bool = True) -> None:
+        self.row = row
+        self.column = column
+        self.is_alive = is_alive
 
 
 class Ship:
-    def __init__(self, start, end, is_drowned=False):
-        # Create decks and save them to a list `self.decks`
-        pass
+    def __init__(self, start: int, end: int) -> None:
+        self.start = start
+        self.end = end
+        self.decks = self._create_decks()
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    def _create_decks(self) -> list | str:
+        (r1, c1), (r2, c2) = self.start, self.end
 
-    def fire(self, row, column):
-        # Change the `is_alive` status of the deck
-        # And update the `is_drowned` value if it's needed
-        pass
+        if r1 == r2:
+            start, end = sorted([c1, c2])
+            return [Deck(r1, c) for c in range(start, end + 1)]
+
+        elif c1 == c2:
+            start, end = sorted([r1, r2])
+            return [Deck(r, c1) for r in range(start, end + 1)]
+
+        raise ValueError
+
+    def get_deck(self, row: int, column: int) -> list[Deck]:
+        for deck in self.decks:
+            if deck.row == row and deck.column == column:
+                return deck
+
+        return None
+
+    def fire(self, row: int, column: int) -> None | str:
+        deck = self.get_deck(row, column)
+        if deck is None:
+            return None
+
+        deck.is_alive = False
+
+        if all(not d.is_alive for d in self.decks):
+            self.is_drowned = True
+            return "Sunk!"
+
+        return "Hit!"
 
 
 class Battleship:
-    def __init__(self, ships):
-        # Create a dict `self.field`.
-        # Its keys are tuples - the coordinates of the non-empty cells,
-        # A value for each cell is a reference to the ship
-        # which is located in it
-        pass
-
-    def fire(self, location: tuple):
-        # This function should check whether the location
-        # is a key in the `self.field`
-        # If it is, then it should check if this cell is the last alive
-        # in the ship or not.
-        pass
+    def __init__(self, ships: list) -> None:
+        self.field = {}
+
+        for start, end in ships:
+            ship = Ship(start, end)
+            for deck in ship.decks:
+                self.field[(deck.row, deck.column)] = ship
+
+    def fire(self, location: tuple) -> str:
+        row, col = location
+
+        if (row, col) not in self.field:
+            return "Miss!"
+
+        ship = self.field[(row, col)]
+        return ship.fire(row, col)