diff --git a/u8/program.py b/u8/program.py
index e69de29..2747c81 100644
--- a/u8/program.py
+++ b/u8/program.py
@@ -0,0 +1,121 @@
+import sys
+
+
+class Node:
+
+  def __init__(self, text):
+    self.text = text
+    self.right = None
+    self.left = None
+    self.otazka = text.endswith("?")
+
+
+def para_stromov(lines, index):
+  if index >= len(lines):
+    raise ValueError("Chybna databaza")
+
+  text = lines[index]
+  if not text:
+    raise ValueError("Chybna databaza")
+
+  node = Node(text)
+  index += 1
+
+  if node.otazka:
+    node.left, index = para_stromov(lines, index)
+    node.right, index = para_stromov(lines, index)
+
+  return node, index
+
+
+def pocet_nodov(node):
+  if not node:
+    return 0, 0
+
+  if node.otazka:
+    a_left, n_left = pocet_nodov(node.left)
+    a_right, n_right = pocet_nodov(node.right)
+    return 1 + a_left + a_right, n_left + n_right
+  else:
+    return 0, 1
+
+
+def main():
+  lines = []
+  while True:
+    try:
+      line = input()
+    except EOFError:
+      break
+    line = line.rstrip("\r")
+    if line == "":
+      lines.append("")
+      break
+    lines.append(line)
+
+  for line in sys.stdin:
+    lines.append(line.rstrip("\r\n"))
+
+  print("Expert zo zoo to vie.")
+
+  if not lines:
+    print("Chybna databaza")
+    return
+
+  try:
+    prvi = lines.index("")
+  except ValueError:
+    print("Chybna databaza")
+    return
+
+  stromlines = lines[:prvi]
+  vibir = [l.strip() for l in lines[prvi + 1 :] if l.strip() != ""]
+
+  if not stromlines:
+    print("Chybna databaza")
+    return
+
+  try:
+    root, druhy = para_stromov(stromlines, 0)
+  except Exception:
+    print("Chybna databaza")
+    return
+
+  if druhy != len(stromlines):
+    print("Chybna databaza")
+    return
+
+  n_pocet, a_pocet = pocet_nodov(root)
+
+  print(f"Pocet otazok: {n_pocet}")
+  print(f"Pocet odpovedi: {a_pocet}")
+  print("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.")
+
+  potocni = root
+  viber_indx = 0
+
+  while potocni.otazka:
+    print(potocni.text)
+
+    if viber_indx >= len(vibir):
+      print("Koniec vstupu")
+      return
+
+    choice = vibir[viber_indx]
+    viber_indx += 1
+
+    if choice != "a" and choice != "n":
+      print("Nerozumiem")
+      return
+
+    if choice == "a":
+      potocni = potocni.left
+    else:
+      potocni = potocni.right
+
+  print(potocni.text)
+  print("Koniec")
+
+
+if __name__ == "__main__":
+  main()
\ No newline at end of file