下列程序段执行后，在标签Label1中显示的图形为______。
    Dim i As Integer
    Dim p As String = "ABCDEFGH"
    Dim s As String
    s = ""
    For i = 1 To 5
          s &= Microsoft.VisualBasic.Left(p, i)
          s &= vbCrLf
    Next
    Label1.Text = s