diff --git a/KislyuninED/docks/data/2-st-exercize/maze-core.py b/KislyuninED/docks/data/2-st-exercize/maze-core.py
new file mode 100644
index 0000000..562af2a
--- /dev/null
+++ b/KislyuninED/docks/data/2-st-exercize/maze-core.py
@@ -0,0 +1,143 @@
+import sys
+from collections import deque
+import heapq
+import time
+import os
+
+
+class Cell:
+    def __init__(self, x, y):
+        self._x = x
+        self._y = y
+        self._is_wall = False
+        self._is_start = False
+        self._is_exit = False
+    
+    @property
+    def x(self):
+        return self._x
+    
+    @property
+    def y(self):
+        return self._y
+    
+    @property
+    def is_wall(self):
+        return self._is_wall
+    
+    @is_wall.setter
+    def is_wall(self, value):
+        self._is_wall = value
+    
+    @property
+    def is_start(self):
+        return self._is_start
+    
+    @is_start.setter
+    def is_start(self, value):
+        self._is_start = value
+    
+    @property
+    def is_exit(self):
+        return self._is_exit
+    
+    @is_exit.setter
+    def is_exit(self, value):
+        self._is_exit = value
+    
+    def is_passable(self):
+        return not self._is_wall
+
+
+class Maze:
+    def __init__(self, width, height):
+        self._width = width
+        self._height = height
+        self._cells = [[Cell(x, y) for x in range(width)] for y in range(height)]
+        self._start = None
+        self._exit = None
+    
+    @property
+    def width(self):
+        return self._width
+    
+    @property
+    def height(self):
+        return self._height
+    
+    @property
+    def start(self):
+        return self._start
+    
+    @property
+    def exit(self):
+        return self._exit
+    
+    def get_cell(self, x, y):
+        if 0 <= x < self._width and 0 <= y < self._height:
+            return self._cells[y][x]
+        return None
+    
+    def set_cell(self, x, y, cell_type):
+        cell = self.get_cell(x, y)
+        if cell is None:
+            return
+        
+        if cell_type == 'wall':
+            cell.is_wall = True
+        elif cell_type == 'start':
+            if self._start:
+                self._start.is_start = False
+            cell.is_start = True
+            cell.is_wall = False
+            self._start = cell
+        elif cell_type == 'exit':
+            if self._exit:
+                self._exit.is_exit = False
+            cell.is_exit = True
+            cell.is_wall = False
+            self._exit = cell
+        elif cell_type == 'path':
+            cell.is_wall = False
+    
+    def get_neighbors(self, cell):
+        neighbors = []
+        directions = [(0, -1), (0, 1), (-1, 0), (1, 0)]
+        for dx, dy in directions:
+            nx, ny = cell.x + dx, cell.y + dy
+            neighbor = self.get_cell(nx, ny)
+            if neighbor and neighbor.is_passable():
+                neighbors.append(neighbor)
+        return neighbors
+
+
+class MazeBuilder:
+    def build_from_file(self, filename):
+        raise NotImplementedError("Need to realise in calss")
+
+
+class TextFileMazeBuilder(MazeBuilder):
+    def build_from_file(self, filename):
+        with open(filename, 'r') as f:
+            lines = [line.rstrip('\n') for line in f.readlines()]
+        height = len(lines)
+        width = max(len(line) for line in lines) if height > 0 else 0
+        start_en = 0
+        exit_en = 0
+        maze = Maze(width, height)
+
+        for y, line in enumerate(lines):
+            for x, ch in enumerate(line):
+                if ch == "#":
+                    maze.set_cell(x, y, "wall")
+                elif ch == "S":
+                    maze.set_cell(x, y, "start")
+                    start_en += 1
+                elif ch == "E":
+                    maze.set_cell(x, y, "exit")
+                    exit_en += 1
+                else:
+                    maze.set_cell(x, y, 'path')
+        if start_en != 1 or exit_en != 1:
+            raise ValueError(f"Labirint must have one S and one E. Found: S={start_en}, E={exit_en}")
+        return maze
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