import sys


class Node:
    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()
    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:
            return None
        right = parse_tree()
        if right is None:
            return None
        return Node(line, left, right)
    else:
        a_counter = 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
        if idx >= len(lines):
            print("Koniec vstupu")
            break
        choice = lines[idx]
        idx = idx + 1

        if choice == 'a':
            current = current.left
        elif choice == 'n':
            current = current.right
        else:
            print("Nerozumiem")
            break

if __name__ == '__main__':
    main()