FWIW: you might be able to use Bitwise String Operators to your benefit. (with different sub-strings of $A and counting the ` afterwards with tr )
But I have problems to match documentation with the behavior of 5.32
DB<32> p "$A $B"
abbaba babbaaaa
DB<33> no feature 'bitwise'; print 'abbaba' & 'babbaaaa'
``b``a
DB<34> no feature 'bitwise'; print $A & $B
0
DB<35> no feature 'bitwise'; print "$A" & "$B"
``b``a
DB<36> print "$A" & "$B"
0
DB<37>
looks like feature bitwise is now default w/o being explicitly explained in perlop
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