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{map({|(1,3,9,|('A'..'Z'))[grep :k,*%3==$^v,($_,(*+1)div-+^*div 3...0)]},1,2).join.flip}
Try it online!Try it online!
No separator. Based on xnor's answer.
{map({|(1,3,9,|('A'..'Z'))[grep :k,*%3==$^v,($_,(*+1)div 3...0)]},1,2).join.flip}
Try it online!
{map({|(1,3,9,|('A'..'Z'))[grep :k,*%3==$^v,($_,-+^*div 3...0)]},1,2).join.flip}
