Problem:
Score : 200 points

Problem Statement

Let w be a string consisting of lowercase letters.
We will call w beautiful if the following condition is satisfied:

Each lowercase letter of the English alphabet occurs even number of times in w.

You are given the string w. Determine if w is beautiful.

Constraints

1 \leq |w| \leq 100

w consists of lowercase letters (a-z).

Input

The input is given from Standard Input in the following format:

w

Output

Print Yes if w is beautiful. Print No otherwise.

Sample Input 1

abaccaba

Sample Output 1

Yes

a occurs four times, b occurs twice, c occurs twice and the other letters occur zero times.

Sample Input 2

hthth

Sample Output 2

No

Solution in Ruby (2.3.3) (judge verdict: Accepted)

hash = Hash.new
array = gets.chomp.split("")
array.each do |str|
  	hash.key?(str) ? hash[str] += 1 : hash.store(str,1)
end
isBeautifulString = "Yes"
hash.each do |key, val|
	if val.odd?
      isBeautifulString = "No"
      break
    end
end
puts isBeautifulString