diff --git a/u8/program.py b/u8/program.py
index b5e019a..62b1d9a 100644
--- a/u8/program.py
+++ b/u8/program.py
@@ -8,6 +8,7 @@ class Node:
 def create_tree(lines, index, counts):
     text = lines[index[0]]
     index[0] += 1
+
     node = Node(text)
 
     if text.endswith("?"):
@@ -20,12 +21,11 @@ def create_tree(lines, index, counts):
     return node
 
 
-
-
 def main():
+    print("Expert zo zoo to vie.")
+    print()
     lines = []
 
-    print("Expert zo zoo to vie.")
     while True:
         line = input()
         if line == "":
@@ -38,13 +38,22 @@ def main():
 
     counts = [0, 0]
     index = [0]
-    root = create_tree(lines, index, counts)
 
+    try:
+        root = create_tree(lines, index, counts)
+        if index[0] != len(lines):
+            print("Chybna databaza")
+            return
+
+    except (IndexError, EOFError):
+        print("Chybna databaza")
+        return
 
     print(f"Pocet otazok: {counts[0]}")
     print(f"Pocet odpovedi: {counts[1]}")
     print("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.")
     print()
+
     current = root
 
     while current.text.endswith("?"):
@@ -54,6 +63,7 @@ def main():
         except EOFError:
             print("Koniec vstupu")
             return
+
         if answer == "a":
             current = current.yes
         elif answer == "n":