单选题 下面程序运行时，若输入“Visual Basic Programming”，则在窗体上输出的是______。
Private Sub Command1_Click()
Dim Num(25)As Integer, Chr1 As String
Chr1=UCase(InputBox("请输入字母字符串"))
For k=1 To Len(Chr1)
n=Asc(Mid(Chr1, k, 1))-Asc("A")
If n＞=0 Then
Num(n)=Num(n)+1
End If
Next k
m=Num(0)
For k=1 To 25
If m＜Num(k)Then
m=Num(k)
End If
Next k
Print m
End Sub