用vb编程,用input函数输入字符串,用msgbox函数输出这个字符串小写字母及个数

Dim r As String, i As Integer, s As Integer, t As String
r = InputBox("请输入：")
For i = 1 To Len(r)
If Asc(Mid(r, i, 1)) > 96 And Asc(Mid(r, i, 1)) < 123 Then
t = t + Mid(r, i, 1)
s = s + 1
End If
Next i
MsgBox t + " " + Str(s)