Is the letter 'A' the alleged seer mentioned an asteroid or comet Atlas 3I? Who knows but those who are alive will experience the Warning (also known as the Illumination of Conscience).
It's a moot point for "Asteroid," but what in language? The alleged seers are native Spanish speakers. It seems that might make a difference to those who hold to Garabandal.
'Q. Many years ago you told us the event of the Warning begins with the letter "A. " Since Our Lady never told you not to reveal it, can you now mention it?
A. She did not forbid it, but I don't know why I haven't said it and I don't feel as though I should say it now.'