Sub proba()
    'inicijalizacija varijabli
    Dim aktivniList As String
    Dim zadnjiRed As Long
    Dim zadnjaKolona As Long
    Dim red As Long
    Dim kolona As Long
    
    'aktivni list
    aktivniList = ActiveSheet.Name
        
    'pronadi zadnju kolonu i zadnji red
    zadnjaKolona = traziZadnjuKolonu(aktivniList)
    zadnjiRed = traziZadnjiRed(aktivniList, 1)
    Range("A1").Select 'pozicioniraj na A1
    
    Dim redBackup()
    Dim inputStr As String
    Dim poruka As String
    Dim nizCount As Long
    
    For red = 1 To zadnjiRed
        For kolona = 1 To zadnjaKolona
            If Cells(red, kolona) = "?" Then
                'stavljanje reda u redBackup niz
                redBackup = Range(Cells(red, 1), Cells(red, zadnjaKolona)) ' .Value
                For nizCount = 0 To UBound(redBackup)
                    poruka = poruka & redBackup(nizCount) & " " 'GRESKA
                Next nizCount
                
ponoviUnos:     inputStr = InputBox(poruka, "UNOS PODATAKA")
                
                If StrPtr(inputStr) = 0 Then
                    'kliknut je prekid
                    MsgBox ("kliknuto je ponisti" & vbNewLine & "pokreni ponovo unos")
                    GoTo ponoviUnos
                Else
                    'podaci uneseni
                    'provjeri ispravnost podataka
                    ispravno = MsgBox(poruka, vbYesNoCancel + vbApplicationModal + vbDefaultButton1, "OVO JE ISPRAVNO??")
                        Select Case ispravno
                            Case vbCancel
                                'ako je pritisnut Cancel, izadi iz procedure
                                Exit Sub
                            Case vbYes
                                'MsgBox ("PODACI SU ISPRAVNI")
                                'upisi podatke u red
                                Cells(red, kolona) = inputStr
                            Case vbNo
                                MsgBox ("PODACI NISU ISPRAVNI")
                                'vrati podatke i ponovi unos
                                Range(Cells(1, 1), Cells(1, zadnjaKolona)) = redBackup
                                GoTo ponoviUnos
                        End Select
                End If
            End If
        Next kolona
    Next red
End Sub

Function traziZadnjiRed(ImeSita As String, kolona)
    Dim Zadnji As Long
    Dim ws As Worksheet
    
    Set ws = Sheets(ImeSita)
    With ws
        Zadnji = .Cells(.Rows.Count, kolona).End(xlUp).Row
    End With
    traziZadnjiRed = Zadnji
End Function

Function traziZadnjuKolonu(ImeSita As String)
    Dim Zadnji As Long
    Dim ws As Worksheet
    Dim zadnjaCelija As Range
    
    Set ws = Sheets(ImeSita)
    
    Set zadnjaCelija = ws.Cells.Find(What:="*", After:=ws.Cells(1, 1), LookIn:=xlFormulas, _
                                    LookAt:=xlPart, SearchOrder:=xlByColumns, _
                                    SearchDirection:=xlPrevious, MatchCase:=False)
    
    Zadnji = zadnjaCelija.Column
    traziZadnjuKolonu = Zadnji
End Function