fml.lua

-- Lua 5.3
-- http://www.familug.org/2015/05/golang-tinh-tu-cung-9gag.html#more


function sum(str)
    _s = 0
    for i = 1, string.len(str) do
        _s = _s + str:lower():byte(i) - string.byte('a') + 1
    end

    return _s
end

io.write(sum('Attitude'))