select distinct substring(name,1,1) from stamps ,np_master where year(stamps.issue_date)=1990 and month(issue_date)=5 and np_master.np_code=stamps.np_code and np_master.np='R' and stamps.serial_no='1405' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1990 >> month >> May >> Currency >> R >> Serial Number >> 1405 >> Alpha >> H >>