I am all letters, and neither, because with respect to life, immortality can be achieved, and with direct respect to immortality and your scale of 'A' to 'Z', then at that point 'Z' serves no measurable purpose to the end of life upon your scale, as life becomes timeless.. . Also if immortality is not achieved before the end of my life, it would also be impossible to know then with respect to mortality until your life ended, and then you would have to compare it to other possible measurable outcomes which are impossible to know with out time travel, however once I have expired than your scale serves no purpose to me, and anything which I state here is only a possible prediction and nothing can be verifiable.. . Although your question was fun :)