my @unsorted = qw/Psdf lPik Easd aKwe SSdf eqwer scfgh Oegb rqwer T/;
print "pre sorted:  @unsorted\n";

my @sorted = map substr($_, 1),
             sort map { /^[a-z]/ ? "A$_" : "B$_" } @unsorted;

print "post sorted: @sorted\n";

__output__

pre sorted:  Psdf lPik Easd aKwe SSdf eqwer scfgh Oegb rqwer T
post sorted: aKwe eqwer lPik rqwer scfgh Easd Oegb Psdf SSdf T