Several comments about this. First of all, you would need
to mod random_number by 26 to make sure you get a valid
letter (or 52 if you want lowercase too, the lowercase
letters follow the capital ones ascii-wise). Secondly,
This is not an internationally or long-term safe way of
doing it, as assuming 65 is 'A' may break things for
someone coming from an international character set, or
if (heaven forbid) the ascii table were to change years
down the line. In general, something like 'A'..'Z' is
safer.
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