in←>•FLines"input"
n←≠in
freqs←∾"0aA"+¨↕¨10‿26‿26
as←∾{(≠⌜˜↕∘≠)⊸(/○⥊)(⊣+-)⌜˜/○⥊⟜(↕≢)𝕩=in}¨freqs
•Show ≠⍷(∧´¨0⊸≤∧<⟜n¨¨)⊸/as
as2←∾{∾(≠⌜˜↕∘≠)⊸(/○⥊){(<𝕩)+(<𝕩-𝕨)×↕n}⌜˜/○⥊⟜(↕≢)𝕩=in}¨freqs
•Show ≠⍷(∧´¨0⊸≤∧<⟜n¨¨)⊸/as2