加密规则如下表所示：

注：“A”的ASCⅡ码值是65，“a”的ASCI码值是97。

n=0:i=l:j=6

key=Val(Text1.Text)

Do While i <=j

 m=(i+j) \ 2

 n=n+1

 If key=d(m) Then Exit Do

 If key > d(m) Then j=m-1 Else i=m+1

Loop

If i<=j Then s=Str(m-n) Else s=Str(n)

d(1)到 d(6)的值依次为“88，77， 53，47， 39，28”，输入某个key值后，运行该程序段后，变量s结果为1，则输入key的值是（  ）

Const n = 100

Dim a(n) As Integer

Private Sub Form_Load()

′产生n个2位正整数，并显示在文本框Text1中，代码略

End Sub

Private Sub Command1_Click( )

    Dim i As Integer, j As Integer, left As Integer

    Dim right As Integer, m As Integer, t As Integer

    i = n-1

    Do While i > = 1

        ________

        right = n

        t = a(i)

        Do While left < = right

            m = Int((left + right)/2)

            If a(m) = t Then right = m: Exit Do

            If a(m) < t Then

                left = m + 1

            Else

                right = m-1

            End If

        Loop

        For j = i To right-1

            a(j) = a(j + 1)

        Next j

        ________________

        i = i-1

        s = “”

        For j = 1 To n

            s = s + Str(a(j))

        Next j

        List1.AddItem s

    Loop

End Sub

s ="ghi jabcdef"

key = Chr(97 + 3 * Int(Rnd * 4))

i =1：j=Len(s)

Do While i< = j

    m=(i+j+1)\2

    ans=ans+Str(m)

    c = Mid(s，m，1)

    If c=key Then Exit Do

    If Mid(s，i，1) < c Then

       If key>=Mid(s，i，1) And key<c Then j=m-1 Else i=m+1

    Else

       If key>c And key <= Mid(s，j，1) Then i =m+1 Else j=m- 1

    End If

Loop

运行程序后，变量ans的值不可能是(    )