[填空题] 设有如下程序 Private Sub Search(a()As Variant, ByVal key As Variant, index%) Dim I% For I=LBound(a) To UBound(a) If key=a(I) ThenIndex=IExit Sub End If Next I Index=-1 End Sub Private Sub Form Load() Show Dim b()As Variant Dim n As Integer b=Array(1,3,5,7,9, 11, 13, 15) Call Search(b, 11, n) Print n End Sub 程序运行后,输出结果是______。