It is 80903, exactly as in the question.
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Composed of letters and numbers
'Alpha' refers to letters. You may recognize it from 'Alphabet'. Numeric refers to numbers. Alpha + Numeric = Alphanumeric, or a list of figures that include both letters and numbers.
it is 26
A from z
It means that in some place of the application any type of symbol is accepted - letters, numbers, spaces, special symbols.