count the character and create a histogram

Booking.com Interview Question Software Engineer
You have the file with word at a single line.
#input sample file
abactor
abaculus
abacus
Abadite
.
.
Zyrenian
#Output
******************************************************************a
*************b
**********************************c
**********************d
*******************************************************************************e
a) you have to count the character and create a histogram in alphabetical order.
b) now you have to produce a histogram with max 80 character in line in reference to max count
c) now same out based histrogram based on the character count
- madeinindia on March 24, 2014 in neitherland for perl backe

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Algorithm:
Read file lines
Initialise character_hash
Accept only ENGLISH LATIN CHARATERS
Buillt character_hash
Find_Maximum_occurence (if bigger than 80 normlise maximum)
Print hystogram
http://eftpos-test.telekomcloud.hr/cgi-bin/mercur_histogram.cgi
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"A Multiset is a set where repetitions are allowed (ex: MS1 = (1,1,2,2,2,3,3,4,4,4,4,4,5,7,7,9...).
Problem: write a program that receives two Multisets and returns intersections (element 2 appears three times on MS1 and five times on MS2 then intersection should contain the element three times."
@ms1 = [1,1,2,2,2,3,3,4,4,4,4,4,5,7,7,9];
@ms2 = [2,3,3,3];
Algorithm:
1. built 2 hashes ms1 and ms2
2. loop through each key and print difference =abs(ms1{key} - ms1{key});