def read_line():
    try:
        line = input()
    except EOFError:
        return None
    if line.endswith("\r"):
        line = line[:-1]
    return line
 
 
def load_tree():
    root = None
    stack = []
    questions = answers = 0
 
    while True:
        line = read_line()
        if not line:
            return None
 
        node = [line, None, None]
        if root is None:
            root = node
        else:
            parent = stack[-1]
            if parent[1] is None:
                parent[1] = node
            else:
                parent[2] = node
                stack.pop()
                
        if line.endswith("?"):
            questions += 1
            stack.append(node)
        else:
            answers += 1
 
        if not stack:
            break
 
    if read_line() != "":
        return None
    return root, questions, answers
 
 
def main():
    print("Expert zo zoo to vie.")
 
    result = load_tree()
    if result is None:
        print("Chybna databaza")
        return
    node, questions, answers = result
 
    print(f"Pocet otazok: {questions}")
    print(f"Pocet odpovedi: {answers}")
    print("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.")
    print(node[0])
 
    while node[1] is not None:
        choice = read_line()
        if choice is None:
            print("Koniec vstupu")
            return
        if choice == "a":
            node = node[1]
        elif choice == "n":
            node = node[2]
        else:
            print("Nerozumiem")
            return
        print(node[0])
 
    print("Koniec")
 
 
if __name__ == "__main__":
    main()