Какая из оценок преобладает в группе студентов - VB

Private Sub Command1_Click()
Dim a As String, Max As Integer, n As Integer, i As Integer
a = "524345443524"
Max = len(a)+1
For i = 1 To 5
  If Len(Replace(a, i, "")) < Max Then Max = Len(Replace(a, i, "")): n = i
Next i
MsgBox "Г‚ ãðóïïå ïðåîáëГ*Г¤Г*ГҐГІ îöåГ*ГЄГ* """ & n & """"
End Sub