# code: http://golf.shinh.org/reveal.rb?313+equals+151/tails_1668386963&nbb
# target Nibbles version: 1.00
# commenter version: 0.1.2.181

| #(filter):[[chr]] 
    ;@ #(= allLines):[[chr]] 
    ~ #(not):null 
    >> #(tail):[[[int]]] <--arg( A:[chr] ) 
        =~ #(group by (also sorts)):[[[int]]] 
            . #(map):[[int]] 
                % #(split (remove empties)):[[chr]] 
                    $ #(= A):[chr] 
                    ~ #(auto = words):auto 
                . #(map):[int] <--arg( B:[chr] ) 
                    $ #(= B):[chr] 
                    ? #(index):int <--arg( C:chr ) 
                        @ #(= B):[chr] 
                        #(implicit arg = C):chr 
            #(implicit arg = D):[int] <--arg( D:[int] )