import sys

def main():
    print("Expert zo zoo to vie.")
    tree_lines = read_tree_lines()
    if not controla_batabaz(tree_lines):
        return
    q = pocet_otazok(tree_lines)
    a = pocet_odpovedi(tree_lines)
    tree = build_tree(tree_lines)
    print("Pocet otazok:", q)
    print("Pocet odpovedi:", a)
    print("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.") 
    koren = tree
    while koren is not None:
        if koren["otazka"].endswith("?"):
            print(koren["otazka"])
            try:
                odpoved = input().rstrip("\r")
            except EOFError:
                print("Koniec vstupu")
                return
            if odpoved == "a":
                koren = koren["a"]
            elif odpoved == "n":
                koren = koren["n"]
            else:
                print("Nerozumiem")
                return
        else:
            print(koren["otazka"])
            print("Koniec")
            break

def build_tree(tree_lines):
    if len(tree_lines) == 0:
        return None
    line = tree_lines.pop(0)
    node = {"otazka": line, "a": None, "n": None}
    if line.endswith("?"):
        node["a"] = build_tree(tree_lines)
        node["n"] = build_tree(tree_lines)
    return node

def pocet_otazok(tree_lines):
    a = 0
    for line in tree_lines:
        if line.endswith("?"):
            a += 1
    return a
def pocet_odpovedi(tree_lines):
    a = 0
    for line in tree_lines:
        if not line.endswith("?"):
            a += 1
    return a

def read_tree_lines():
    tree_lines = []
    text = input().rstrip("\r")
    while text:
        tree_lines.append(text)
        text = input().rstrip("\r")
    return tree_lines

def controla_batabaz(tree_lines):
    if tree_lines is None or len(tree_lines) == 0:
        print("Chybna databaza")
        return False
    return True



if __name__ == "__main__":
    main()