1. (2021·浙江模拟) 有如下VB程序段：

k = 0

For i = 1 To 10

    If b(a(i)) = 0 Then k = k + 1

    b(a(i)) = b(a(i)) + 1

Next i

For i = 1 To k

    p = 1

    For j = 2 To 10

       If b(j) > b(p) Then p = j

    Next j

    b(p) = 0

    s = s + Str(p)

Next i

数组a(1)～a(10)的元素分别为2,5,3,8,8,5,8,9,5,3。数组b(1)～b(10)的元素初始值均为0，执行程序后，变量s的值为（   ）