select distinct substring(name,1,1) from stamps ,np_master where year(stamps.issue_date)=1991 and month(issue_date)=8 and np_master.np_code=stamps.np_code and np_master.np='R' and stamps.serial_no='1463' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1991 >> month >> August >> Currency >> R >> Serial Number >> 1463 >> Alpha >> R >>