diff --git a/app/main.py b/app/main.py
index 626f41cf..073131fb 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 get_coordinates(self) -> tuple:
+        return self.row, self.column
+
+    def hit(self) -> None:
+        self.is_alive = False
 
 
 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 = False
+    ) -> None:
+        self.start = start
+        self.end = end
+        self.is_drowned = is_drowned
+        self.decks = self.create_decks()
+        self.is_drowned = is_drowned
+
+    def create_decks(self) -> list:
+        decks = []
+        if self.start[0] == self.end[0]:
+            for column in range(self.start[1], self.end[1] + 1):
+                decks.append(Deck(self.start[0], column))
+        else:
+            for row in range(self.start[0], self.end[0] + 1):
+                decks.append(Deck(row, self.start[1]))
+        return decks
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    def get_deck(self, row: int, column: int) -> Deck:
+        for deck in self.decks:
+            if deck.get_coordinates() == (row, column):
+                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) -> str:
+        deck = self.get_deck(row, column)
+        if deck:
+            deck.hit()
+            if all(not deck.is_alive for deck in self.decks):
+                self.is_drowned = True
+                return "Sunk!"
+            return "Hit!"
+        return "Miss!"
 
 
 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.ships = [Ship(start, end) for start, end in ships]
+        self.field = [["~"] * 10 for _ in range(10)]
+
+    def place_ships(self) -> None:
+        for ship in self.ships:
+            for deck in ship.decks:
+                self.field[deck.row][deck.column] = "□"
+
+    def fire(self, location: tuple) -> str:
+        row, column = location
+        for ship in self.ships:
+            result = ship.fire(row, column)
+            if result == "Hit!" or result == "Sunk!":
+                self.field[row][column] = "x"
+                return result
+        self.field[row][column] = "o"
+        return "Miss!"