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)