diff --git a/u8/program.py b/u8/program.py
index 2665718..d53c945 100644
--- a/u8/program.py
+++ b/u8/program.py
@@ -2,74 +2,83 @@ import sys
 
 
 class Node:
-    def __init__(self, text, left = None, right = None):
+    def __init__(self, text, left=None, right=None):
         self.text = text
         self.left = left
         self.right = right
 
+
 def main():
     print("Expert zo zoo to vie.")
+
     input_data = sys.stdin.read()
+    if not input_data:
+        print("Chybna databaza")
+        return
+
     lines = input_data.splitlines()
     if not lines:
         print("Chybna databaza")
         return
 
-
     q_counter = 0
     a_counter = 0
     idx = 0
 
     def parse_tree():
         nonlocal idx, q_counter, a_counter
-    if idx >= len(lines):
-        return None
-    line  = lines[idx]
-    idx = idx + 1
-
-
-    if line == "":
-        return None
-
-
-    if line.endswith('?'):
-        q_counter = q_counter + 1
-        left = parse_tree()
-        if left is None:
+        if idx >= len(lines):
             return None
-        right = parse_tree()
-        if right is None:
+
+        line = lines[idx]
+        idx += 1
+
+        if line == "":
             return None
-        return Node(line, left, right)
-    else:
-        a_counter = a_counter + 1
-        return Node(line)
-    
+
+        if line.endswith('?'):
+            q_counter += 1
+            left = parse_tree()
+            if left is None:
+                return None
+            right = parse_tree()
+            if right is None:
+                return None
+            return Node(line, left, right)
+        else:
+            a_counter += 1
+            return Node(line)
+
     root = parse_tree()
 
+   
     if root is None or idx >= len(lines) or lines[idx] != "":
         print("Chybna databaza")
         return
 
-
     print(f"Pocet otazok: {q_counter}")
     print(f"Pocet odpovedi: {a_counter}")
     print("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.")
 
+    
     idx += 1
 
-
     current = root
     while True:
         print(current.text)
+
+      
         if not current.text.endswith('?'):
             print("Koniec")
             break
+
+        #koniec vstup
         if idx >= len(lines):
             print("Koniec vstupu")
             break
+
         choice = lines[idx]
-        idx = idx + 1
+        idx += 1
 
         if choice == 'a':
             current = current.left
@@ -79,5 +88,6 @@ def main():
             print("Nerozumiem")
             break
 
+
 if __name__ == '__main__':
     main()
\ No newline at end of file