a←•BQN¨•Flines"input" # Fn←{+´(¯1⊸↓<1⊸↓)+˝˘ 𝕨↕𝕩} Fn←{+´0>𝕨↓⌽𝕩-𝕨⌽𝕩} •Show 1 Fn a # part 1 •Show 3 Fn a # part 2