1. (2020高三上·浙江期末) 有如下 VB 程序段：

s = " Good Luck 2021！"：n = 0 : m = 0 : k = 0

For i = 1 To Len(s)

    c = Mid(s,i,1)

    If c >= "0" And c <= "9" Then

        n = n + 1

    ElseIf c >= "a" And c <= "z" Then

        k = k + 1

    Else

        m = m + 1

    End If

Next i

執(zhí)行該程序段后，變量 m 的值為（    ）