LUA

 function string.swap(str)
    return str:gsub(".", function(thing)
    if thing == thing:upper() then
        return thing:lower()
    else
        return thing:upper()
    end end)
end
_g = _G
_G = nil
_version = "lua 5.2.2"
_VERSION = nil
local oprint = print
function print(...)
    local data = {...}
    for i = 1,#data do
        if type(data[i]) == "string" then
            data[i] = string.swap(data[i])
        end
    end
    oprint(table.unpack(data))
end
exec=string.swap(exec)
local ret = { pcall(load(exec)) }
if ret[1] then
    for i = 2,#ret do
        if type(ret[i]) == "string" then
            ret[i] = string.swap(ret[i])
        end
    end
    return table.unpack(ret,2)
else
    error(string.swap(ret[2]),0)
end