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)

w = gets.chomp
app = {}
w.each_char do |ch|
  if app.key?("#{ch}")
    app["#{ch}"] += 1
  else
    app["#{ch}"] = 1
  end
end
answer = "Yes"
if app.size == 0
  puts answer
else
  app.each do |key, value|
  	if value % 2 != 0
      answer = "No"
    end
  end
  puts answer
end