c = function(txt) local x = string.reverse(txt) local nt = "" local s = false for i = 1,#txt do if not s then s = true nt = nt..string.sub(x,i+1,i+1) else s = false nt = nt..string.sub(x,i-1,i-1) end end if #x%2~=0 then nt = nt..string.sub(x,#x,#x) end return nt end