# code: http://golf.shinh.org/reveal.rb?alternating+case+lines/tails_1645795701&nbb
# target Nibbles version: 0.24
# commenter version: 0.1.2.181

! #(zip with):[[chr]] 
    allLines #(;;@):[[chr]] 
    \A 
    , #(range from 1):[int] 
        ~ #(auto = infinity):auto 
    ~ #(zipop: by):null 
    \C B 
    . #(map):[chr] 
        C #($):[chr] 
        \D 
        ? #(if/else):chr 
            % #(modulus):int 
                B #(_):int 
                ~ #(auto = 2):auto 
            \E 
            `) #(to uppercase):chr 
                D #(@):chr 
            `( #(to lowercase):chr 
                D #($):chr