diff --git a/app/main.py b/app/main.py
index 626f41cf..7935ec85 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,34 +1,68 @@
 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
+
+    def __getitem__(self, item: int) -> int:
+        if item == 0:
+            return self.row
+        elif item == 1:
+            return self.column
 
 
 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: tuple,
+            end: tuple,
+            is_drowned: bool | None = False
+    ) -> None:
+        self.is_drowned = is_drowned
+        self.decks = []
+        if start[0] == end[0]:
+            start_point = start[1]
+            end_point = end[1] + 1
+            for column in range(start_point, end_point):
+                self.decks.append(Deck(start[0], column))
+        elif start[1] == end[1]:
+            start_point = start[0]
+            end_point = end[0] + 1
+            for row in range(start_point, end_point):
+                self.decks.append(Deck(row, end[1]))
+        elif start[0] == end[0] and start[1] == end[1]:
+            self.decks.append(Deck(start[0], end[0]))
 
-    def get_deck(self, row, column):
+    def get_deck(self, row: int, column: int) -> Deck:
         # Find the corresponding deck in the list
-        pass
+        for deck in self.decks:
+            if row == deck[0] and column == deck[1]:
+                return deck
 
-    def fire(self, row, column):
-        # Change the `is_alive` status of the deck
-        # And update the `is_drowned` value if it's needed
-        pass
+    def fire(self, row: int, column: int) -> None:
+        deck = self.decks.index(self.get_deck(row, column))
+        self.decks[deck].is_alive = False
+        self.is_drowned = not any(deck.is_alive for deck in self.decks)
 
 
 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[Ship]) -> None:
+        self.field = {}
+        for data in ships:
+            ship = Ship(data[0], data[1])
+            for deck in ship.decks:
+                self.field[(deck[0], deck[1])] = ship
+
+    def fire(self, location: tuple) -> str:
+        if location in self.field:
+            if isinstance(self.field[location], Ship):
+                self.field[location].fire(location[0], location[1])
+                if not self.field[location].is_drowned:
+                    return "Hit!"
+                return "Sunk!"
+        return "Miss!"