Given a number n and a pattern that follows like:
(1 to 26): a,b,c,….z
(27 to 52): aa,ab,ac,…az
(52 to 78): ba,bb,bc,…bz
. . . za,zb,zc,…zz
aaa,aab,aac,…aaz
aba,abb,abc,… . . . find the nth pattern
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