# code: http://golf.shinh.org/reveal.rb?atomic+numbers/tails_1642139838&nbb
# target Nibbles version: 0.21
# commenter version: 0.1.2.181

#(implicit map):[int] 
    `) #(swapped uncons):[[chr]] 
        allLines #(;;@):[[chr]] 
    sets A 
    \C B 
    ? #(index):int 
        % #(split (remove empties)):[[chr]] 
            A #(_):[chr] 
            ~ #(auto = words):auto 
        #(implicit arg = C):[chr]