I want to map letters to numbers for testing public key crypto.
I understand the following does this for me:

sage: m = "HELLOWORLD"
sage: m = [ord(c) for c in m] ; m
[72, 69, 76, 76, 79, 87, 79, 82, 76, 68]

however, if I want to define my own mapping, e.g. (A = 5, B= 6, C =
7), how do I set this in sage?

thanks.

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