PERL counting words that are missing a vowel

Write a program called no_vowels.pl that will count
how many words DO NOT have an 'a' or an 'A',
how many DO NOT have an 'e' or an 'E',
how many DO NOT have an 'i' or an
'I', and so on.

The output should look like the below. 
Note that the letters must be listed in decreasing order of frequency

14000 words do not have an 'u'
11258 words do not have an 'o'
10123 words do not have an 'i'
11523 words do not have an 'a'
10111 words do not have an 'e'

>>43
yes that is clear to me that it sorts in a specific way.
but it is a hash. and a hash is key:value
so how do i say: pls use only the values for the comparsion and not the key.

>>43
sry i didnt understand at first.

ok so $hash($a) means use the values.
and how do i access the key?