# code: http://golf.shinh.org/reveal.rb?code+golf+meetup+2025/whio_1749502772&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.6.187

+ #(concat):[chr] 
    . #(map):[[chr]] 
        `= #(chunk by):[[chr]] 
            fstLine #(@):[chr] 
            \A 
            A #($):chr 
        \B 
        > #(drop):[chr] 
            - #(subtract):int 
                ~ #(auto = 1):auto 
                , #(length):int 
                    B #($):[chr] 
            : #(append):[chr] 
                #(implicit arg = B):[chr] 
                #(implicit arg = B):[chr]