select distinct substring(name,1,1) from stamps ,color_master where color_master.color_code=stamps.color_code and color_master.color='Violet' and stamps.serial_no='0527' and year(stamps.issue_date)=1966 order by substring(name,1,1)
IndianPost
Color >> Violet >> Serial Number >> 0527 >> Issue Date >> year >> 1966 >> Alpha >> S >>