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#Erlang, 26 bytes
f([X])->X-64;f(X)->[X+64].
One of the few times where Erlang's string behavior is useful.
#Erlang, 3526 bytes
f(X)when X<27->[X+64];f([X])->X-6464;f(X)->[X+64].
#Erlang, 35 bytes
f(X)when X<27->[X+64];f([X])->X-64.
