select distinct substring(name,1,1) from stamps ,np_master where year(stamps.issue_date)=1977 and month(issue_date)=4 and np_master.np_code=stamps.np_code and np_master.np='R' and stamps.serial_no='0843' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1977 >> month >> April >> Currency >> R >> Serial Number >> 0843 >> Alpha >> E >>