# code: http://golf.shinh.org/reveal.rb?Base+37/tails_1644906898&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

#(implicit map):[chr] 
    `@ #(to base):[int] 
        37 #(integer):int 
        fstInt #($):int 
    \B A 
    = #(subscript (wrapped)):chr 
        + #(add):int 
            B #($):int 
            ~ #(auto = 1):auto 
        . #(map):[chr] 
            | #(filter):[chr] 
                . #(map):[chr] 
                    , #(range from 1):[int] 
                        ~ #(auto = infinity):auto 
                    \C 
                    ch #(chr):chr 
                        C #($):int 
                \D 
                \ #(char class):[chr] 
                    D #($):chr 
                    n #(isAlphaNum):null 
            \E 
            - #(subtract):chr 
                + #(add):int 
                    `( #(to lowercase):chr 
                        E #($):chr 
                    `) #(to uppercase):chr 
                        E #($):chr 
                #(implicit arg = E):chr