# code: http://golf.shinh.org/reveal.rb?Fill+in+the+blanks/tails_1645664315&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

+ #(concat):[chr] 
    ! #(zip with):[[chr]] 
        `% #(split list (keep empties)):[[chr]] 
            > #(drop):[chr] 
                + #(add):int 
                    , #(length):int 
                        fstLine #(@):[chr] 
                    ~ #(auto = 1):auto 
                allInput #(;_):[chr] 
            "_" #(string):[chr] 
        \A 
        : #(append):[chr] 
            fstLine #(_):[chr] 
            "\n" #(string):[chr] 
        : #(zipop: cons):null