1. (2020高二上·诸暨期末) 有如下VB程序段：

s1 = Text1.Text

s2 = ""

For i = 1 To Len(s1)

    c = Mid(s1, i, 1)

    If c >= "A" And c <= "Z" Then

        c = Chr(Asc(c) + 32)

    ElseIf c >= "0" And c <= "9" Then

        c = Chr((Asc(c) - Asc("0") + 2) Mod 10 + Asc("0"))

    End If

    s2 = c + s2

Next i

Text2.Text = s2

该程序段运行后，若在文本框Text1中输入“A19bCD”，则文本框Text2中显示的内容是（    ）