import sys

class Node:
    def __init__(self, text):
        self.text = text
        self.yes = None
        self.no = None

def create_tree(lines, index, counts):
    if index[0] >= len(lines):
        raise ValueError
    node = Node(lines[index[0]])
    index[0] += 1

    if node.text.endswith("?"):
        counts[0] += 1
        node.yes = create_tree(lines, index, counts)
        node.no = create_tree(lines, index, counts)
    else:
        counts[1] += 1

    return node


def main():
    print("Expert zo zoo to vie.")
    lines = []

    while True:
        line = sys.stdin.readline()
        if line == "":
            print("Chybna databaza")
            return
        line = line.rstrip("\r\n")
        if line == "":
            break
        lines.append(line)
    if len(lines) == 0:
        print("Chybna databaza")
        return
    counts = [0, 0]
    index = [0]

    try:
        root = create_tree(lines, index, counts)
        if index[0] != len(lines):
            raise ValueError

    except (ValueError, RecursionError):
        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.")

    current = root

    while True:
        print(current.text)
        if not current.text.endswith("?"):
            break

        answer = sys.stdin.readline()
        if answer == "":
            print("Koniec vstupu")
            return

        answer = answer.rstrip("\r\n")
        if answer == "a":
            current = current.yes
        elif answer == "n":
            current = current.no
        else:
            print("Nerozumiem")
            return

    print("Koniec")


if __name__ == "__main__":
    main()