Select Code to Download

foreach $month (%keys %ManagerInCharge) {
   my $month_hash = $ManagerInCharge{$month};
...
   my $i;
   $ManagerInCharge{$month} = { map { ++$i => $_ } @month_array };
}

foreach $month (%keys %ManagerInCharge) {
   my $month_hash = $ManagerInCharge{$month};
...
   };
   $ManagerInCharge{$month} = \@month_array;
}