rearrange cells based on its numerical values without repeating

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with this sub

Sub doit()
Range("M1").CurrentRegion.ClearContents
Range("A1").Resize(10, 2).Copy Destination:=Range("M1")
Range("M1").CurrentRegion.Sort Key1:=Range("M1"), Order1:=xlAscending
End Sub


it works
but i dont want to repeat the numbers
i mean
if i input
1 microsoft
2 intel
1 microsoft
the results will be
1
1
2


i dont want that
i want only
1
2
no repeating
how can i do that?
noting that the input my be so long may be 1000 rows
but they are only 50 companies (from 1 to 50)
so the results will be in a max 50 rows

and i want that code to activate(rerun) each time i enter the sheet2

how can i do that ??


--
amrezzat
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