1. (2022·浙江模拟) 有如下 Python 程序段：

shu = ""; k = 0; qiu = ""

x = '394-5-222-60-809'

for ch in range(len(x)):

    if '0' <= x[ch] <= '9':

        k = k + 1

    else:

        shu = x[ch-k:ch]

        if qiu < shu:    qiu = shu + qiu

            k = 0

print(qiu)

执行该程序段后，输出结果是（   ）