 Cunningham's sentencing judge had no discretion to select a sentence within the range of 6 to 16 years.Her instruction was to select 12 years, nothing less and nothing more, unless she found facts allowing the imposition of a sentence of 6 or 16 years.Factfinding to elevate a sentence from 12 to 16 years, our decisions make plain, falls within the province of the jury employing a beyond-a-reasonable-doubt standard, not the bailiwick of a judge determining where the preponderance of the evidence lies."