1. (2022·浙江模拟) 某对分查找算法的 Python 程序如下：

left = 0; right = 7; s = ""

d = [14,23,29,34,38,42,52,69]

key = int(input('请输入要查找的数据'))

while left <= right:

    mid = (left + right) // 2

    if key == d[mid]:

        s = s + "M"

        if key <= d[mid]:

            right = mid - 1; s = s + "L"

        else:

            left = mid + 1; s = s + "R"

该程序段执行后，显示的内容可能是（   ）