diff --git a/app/main.py b/app/main.py
index 626f41cf..cd067261 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,34 +1,71 @@
 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 = list()
+        if start[0] < end[0]:
+            self.decks.extend([
+                Deck(deck_n, start[1])
+                for deck_n in range(start[0], end[0] + 1)
+            ])
+        elif start[1] < end[1]:
+            self.decks.extend([
+                Deck(start[0], deck_n)
+                for deck_n in range(start[1], end[1] + 1)
+            ])
+        else:
+            self.decks.append(Deck(start[0], start[1]))
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+        self.health = len(self.decks)
 
-    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 get_deck(self, row: int, column: int) -> Deck:
+        return [
+            deck
+            for deck in self.decks
+            if deck.row == row and deck.column == column
+        ][0]
+
+    def fire(self, row: int, column: int) -> None:
+        if deck := self.get_deck(row, column):
+            deck.is_alive = False
+            self.health -= 1
+        if self.health == 0:
+            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, tuple]) -> None:
+        self.field = dict()
+        for start_stop in ships:
+            new_ship = Ship(start_stop[0], start_stop[1])
+            for deck in new_ship.decks:
+                self.field[deck.row, deck.column] = new_ship
+
+    def fire(self, location: tuple[int, int]) -> str:
+        if location not in self.field:
+            return "Miss!"
+
+        self.field[location].fire(location[0], location[1])
+        if self.field[location].health == 0:
+            return "Sunk!"
+        else:
+            return "Hit!"
+
+    def field_print(self) -> None:
+        for row in range(10):
+            for column in range(10):
+                if (row, column) in self.field:
+                    print(u"\u25A1", 5 * " ", end="")
+                else:
+                    print("~", 5 * " ", end="")
+            print()