# code: http://golf.shinh.org/reveal.rb?1+11+14+20+f/tails_1667799253&nbb
# target Nibbles version: 1.00
# commenter version: 0.1.2.181

`? #(find indices [by]):[int] 
    @ #(= fstLine):[chr] 
    \ #(char class):[chr] <--arg( A:chr ) 
        $ #(= A):chr 
        u #(isUpper):null