def METHOD_NAME(list_a: List[Tuple[str, str]], list_b: List[Tuple[str, str]]) -> float:
    """
    Calculate extra metrics of word-tag
    Args:
        list_a: prediction list
        list_b: real list
    Returns:
        acc: the extra accuracy
    """
    p, q = 0, 0
    a_l, b_l = 0, 0
    acc = 0.0
    while q < len(list_b) and p < len(list_a):
        a_r = a_l + len(list_a[p][0]) - 1
        b_r = b_l + len(list_b[q][0]) - 1
        if a_r < b_l:
            p += 1
            a_l = a_r + 1
            continue
        if b_r < a_l:
            q += 1
            b_l = b_r + 1
            continue
        if a_l == b_l and a_r == b_r:
            if list_a[p][-1] == list_b[q][-1]:
                acc += 1.0
            p += 1
            q += 1
            a_l, b_l = a_r + 1, b_r + 1
            continue
        p += 1
    return acc