select distinct substring(name,1,1) from stamps ,printsize_master where year(stamps.issue_date)=1971 and month(issue_date)=2 and stamps.serial_no='0633' and printsize_master.printsize_code=stamps.printsize_code and printsize_master.printsize='2.54 X 2.5' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1971 >> month >> February >> Serial Number >> 0633 >> Print Size >> 2.54 X 2.5 >> Alpha >> S >>