rh_input.txt

AA...OP..Q.OPXXQ.OP..Q..B...CCB.RRR.
A..OOOA..B.PXX.BCPQQQ.CP..D.EEFFDGG.
.............XXO...AAO.P.B.O.P.BCC.P
O..P..O..P..OXXP....AQQQ..A..B..RRRB
AA.O.BP..OQBPXXOQGPRRRQGD...EED...FF
AA.B..CC.BOP.XXQOPDDEQOPF.EQ..F..RRR
.ABBCD.A.ECD.XXE.F..II.F...H.....H..
...AAO..BBCOXXDECOFFDEGGHHIPPPKKIQQQ
.ABBCC.A.DEEXX.DOFPQQQOFP.G.OHP.G..H
AAB.CCDDB..OPXX..OPQQQ.OP..EFFGG.EHH
OAAP..O..P..OXXP....BQQQ..B..E..RRRE
ABB..OA.P..OXXP..O..PQQQ....C.RRR.C.
AABBC...D.CO.EDXXOPE.FFOP..GHHPIIGKK
AAB.....B.CCDEXXFGDEHHFG..I.JJKKI...
.AABB.CCDDOPQRXXOPQREFOPQREFGG.HHII.
AABBCOD.EECODFPXXO.FPQQQ..P...GG....
AOOO..A.BBCCXXD...EEDP..QQQPFGRRRPFG
AABO..CCBO..PXXO..PQQQ..PDD...RRR...
..ABB...A.J..DXXJ..DEEF..OOOF.......
A..OOOABBC..XXDC.P..D..P..EFFP..EQQQ
AABO..P.BO..PXXO..PQQQ...........RRR
..AOOOB.APCCBXXP...D.PEEFDGG.HFQQQ.H
..OOOP..ABBP..AXXP..CDEE..CDFF..QQQ.
..ABB..CA...DCXXE.DFF.E.OOO.G.HH..G.
AAB.CCDDB..OPXX.EOPQQQEOPF.GHH.F.GII
.A.OOOBA.CP.BXXCPDERRRPDE.F..G..FHHG
ABBO..ACCO..XXDO.P..DEEP..F..P..FRRR
OOOA....PABBXXP...CDPEEQCDRRRQFFGG.Q
OOO.P...A.P.XXA.PBCDDEEBCFFG.HRRRG.H
O.APPPO.AB..OXXB..CCDD.Q.....QEEFF.Q
AA.OOO...BCCDXXB.PD.QEEPFFQ..P..QRRR
AAOBCC..OB..XXO...DEEFFPD..K.PHH.K.P
.AR.BB.AR...XXR...IDDEEPIFFGHPQQQGHP
A..RRRA..B.PXX.BCPQQQDCP..EDFFIIEHH.
..OAAP..OB.PXXOB.PKQQQ..KDDEF.GG.EF.
OPPPAAOBCC.QOBXX.QRRRD.Q..EDFFGGE...
AAB.CCDDB.OPQXX.OPQRRROPQ..EFFGG.EHH
A..OOOABBC..XXDC.R..DEER..FGGR..FQQQ
..AOOO..AB..XXCB.RDDCEERFGHH.RFGII..
OAA.B.OCD.BPOCDXXPQQQE.P..FEGGHHFII.