Take the spelling of your full name as it reads on your driver’s license (or other major govt ID)
Take the spelling of the city in which you were born.
Take the spelling of the month in which you were born.
Take the spelling of the last country you visited outside that of your current permanent residence.
Take the alphabet and, from A-Z, eliminate every letter that shows up at least once in the spellings you’ve already listed.
What letters do you have left?
Me: F J K V X Y Z (or a nightmare scrabble hand)
How few letters are left with you?