diff --git a/app/main.py b/app/main.py
index 626f41cf..ac2aaa93 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,34 +1,101 @@
 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: tuple,
+                 end: tuple,
+                 is_drowned: bool = False) -> None:
+        self.is_drowned = is_drowned
+        self.decks = [
+            Deck(row, column)
+            for row in range(start[0], end[0] + 1)
+            for column in range(start[1], end[1] + 1)]
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    def get_deck(self, row: int, column: int) -> Deck | None:
+        for deck in self.decks:
+            if row == deck.row and column == deck.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) -> None:
+        self.get_deck(row, column).is_alive = False
+        if any([deck.is_alive for deck in self.decks]) is False:
+            self.is_drowned = True
 
 
 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[tuple]) -> None:
+        self.field = {}
+        for start, end in ships:
+            cords = [
+                (row, column)
+                for row in range(start[0], end[0] + 1)
+                for column in range(start[1], end[1] + 1)]
+            ship = Ship(start, end)
+            for cord in cords:
+                self.field[cord] = ship
+        self._validate_input(ships)
+
+    def fire(self, location: tuple) -> str:
+        ship = self.field.get(location)
+        if ship:
+            ship.fire(*location)
+            if ship.is_drowned is True:
+                return "Sunk!"
+            return "Hit!"
+        return "Miss!"
+
+    def print_field(self) -> None:
+        for row in range(9 + 1):
+            for column in range(9 + 1):
+                ship = self.field.get((row, column))
+                if ship:
+                    deck = ship.get_deck(row, column)
+                    if ship.is_drowned:
+                        print(" X ", end="")
+                        continue
+                    elif deck.is_alive:
+                        print(u" \u25A1 ", end="")
+                    else:
+                        print(" * ", end="")
+                else:
+                    print(" ~ ", end="")
+            print("")
+
+    def _validate_input(self, ships: list[tuple]) -> None:
+        # Check if count of ships == 10
+        if len(ships) < 10:
+            raise ValueError(f"Count of ships should be"
+                             f"equal 10, got {len(ships)} instead")
+        count_of_ships = {1: 0, 2: 0, 3: 0, 4: 0, }
+        list_of_ships = list(self.field.values())
+        # Counting each ship type, and adding it to dict
+        for ship in set(list_of_ships):
+            count_of_ships[list_of_ships.count(ship)] += 1
+        # Checking if there is correct count of each ship type
+        if ([count_of_ships[1], count_of_ships[2],
+             count_of_ships[3], count_of_ships[4]] != [4, 3, 2, 1]):
+            raise ValueError(f"There should be: \n"
+                             f"4 one-deck ships, "
+                             f"got {count_of_ships[1]} instead\n"
+                             f"3 double-deck ships, "
+                             f"got {count_of_ships[2]} instead\n"
+                             f"2 three-deck ships, "
+                             f"got {count_of_ships[3]} instead\n"
+                             f"1 four-deck ship, "
+                             f"got {count_of_ships[4]} instead")
+        # Checking if there ships in neighboring cells
+        for cord, ship in self.field.items():
+            for row in range(cord[0] - 1, cord[0] + 2):
+                for column in range(cord[1] - 1, cord[1] + 2):
+                    self._check_ceil(row, column, ship)
+
+    def _check_ceil(self, row: int, column: int, ship: Ship) -> None:
+        if (self.field.get((row, column))
+                and self.field.get((row, column)) != ship):
+            raise ValueError("Ships cannot be in neighboring cells"
+                             "(even if cells are neighbors by diagonal)")