Re^2: Change variable multiple times within a single string?

[GotToBTru]

use warnings;
use strict;

my $string="A111B111A111B111";
my $yes_or_no="no";
for (reverse(split //, $string)) {
    if ($_ eq 'A') {
        $yes_or_no = 'yes';
        print "$_ yes_or_no=$yes_or_no\n";
        last;
    }
    if ($_ eq 'B') {
        $yes_or_no = 'no';
        print "$_ yes_or_no=$yes_or_no\n";
        last;
    }
}