sub alfNum {
    my ($aAlf, $aNum) = $a =~ /([a-z]+)(\d+)/i;
    my ($bAlf, $bNum) = $b =~ /([a-z]+)(\d+)/i;
    
    return $aAlf cmp $bAlf if $aAlf ne $bAlf;
    return $aNum <=> $bNum;
}

##</code><code>##

use strict;
use warnings;
use Data::Dump::Streamer;

use strict;
use warnings;

my %hoh =
    (
    A10 => {bl=>0, ff=>4, gg=>3},
    A2 => {cc=>5, dd=>4, ee=>9},
    A21 => {cd=>5, de=>4, ef=>9},
    B21 => {og=>0, wo=>4, ee=>3},
    B3 => {oa=>0, wd=>4, ec=>3},
    B2 => {oo=>5, pp=>4, zz=>9},
    );

my %alphaKeys;

push @{$alphaKeys{(/^([a-z]+)/i)[0]}}, $_ for keys %hoh;
keys %hoh;

for (sort keys %alphaKeys) {
    my @lines;
   
    for my $key (sort alfNum @{$alphaKeys{$_}}) {
        my $index = 0;
        $lines[$index++] .= sprintf "%-20s", $key;
       
        my %items = %{$hoh{$key}};
        $lines[$index++] .= sprintf "%-20s", "$_=>$items{$_}" for sort keys %items;
    }

    print "$_\n" for @lines;
    print "\n";
}

sub alfNum {
    my ($aAlf, $aNum) = $a =~ /([a-z]+)(\d+)/i;
    my ($bAlf, $bNum) = $b =~ /([a-z]+)(\d+)/i;
    
    return $aAlf cmp $bAlf if $aAlf ne $bAlf;
    return $aNum <=> $bNum;
}

##</code><code>##

A2                  A10                 A21                 
cc=>5               bl=>0               cd=>5               
dd=>4               ff=>4               de=>4               
ee=>9               gg=>3               ef=>9               

B2                  B3                  B21                 
oo=>5               ec=>3               ee=>3               
pp=>4               oa=>0               og=>0               
zz=>9               wd=>4               wo=>4