<BR><BR>

my @numbers = ('25', '12', '32','56','45','21','65');
my @needed =('25','32','45','65');
my %hashofscalars = map{ $_ ,1}@needed;
my $scalar;
my @res_scalars;

foreach ( @numbers) {    
   if (exists  $hashofscalars{$_}){
      $scalar++;push(@res_scalars ,$_);
   }elsif($scalar%2 != 0){ 
      push(@res_scalars,$_)
   }
};
print "[@res_scalars]\n";  
__END__

[25 12 32 45 21 65]