select distinct substring(name,1,1) from stamps ,paper_master,np_master where year(stamps.issue_date)=1981 and month(issue_date)=4 and paper_master.paper_code=stamps.paper_code and paper_master.paper='Unwatermarked P.G. Matt coated paper' and np_master.np_code=stamps.np_code and np_master.np='R' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1981 >> month >> April >> Paper >> Unwatermarked P.G. Matt coated paper >> Currency >> R >> Alpha >> H >>