...because a Pirate doesn't play fair even when he does:
(Edit: since you aren't linguaphiles like me, you probably won't play fair by using pen and paper, so i've eliminated all special characters and lowercase, for the sake of your script. Please note however, that house rules vary in this particular cipher, and a script that doesn't account for them might return gibberish. i would highly suggest pen-and-paper cryptanalysis.)

LZ OL WI NI GV UA OB OY CV CG GV LD SE LT GC OA PR GT QU YQ BH GD BU TK FP SB SI SV LI VN PO HN ZF ZR GB OG WI GP CP HU SE DA OL QN SL CB BQ GT GD PF SA CT CV DP SE RP IW SM FC DP VB UQ GF IU TQ OU UH FV UH HB DP IN DR SA AN DP SV QO BV OW BQ GF UA UH AY OW IW IX OW FB KC VA AU IM AO BR IG CP IB KY HY PO DY OT PT DH BP QE LI AT FR CP RC BV TA LD SE PS WS VG IO SB NB OD UI OI AH YK CB PC YI AC BF GP GV HU PC BU AP GB RA BS OF GD IY DN UH GV DN YQ IM QU BV OW UN KR DB VC LY OW SM CA DN IN SE IB IM BR IG CP PF ZR PO IM BD UH ZK GV AU YQ BD PR QO NU PO MP GB YD GF BR IG CP PS CL DV IW AC