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: Wrong Answer)

def main()
  line = gets
  line = line.chomp

  wArr = line.chars
  wArr_sorted = wArr.sort

  _e = wArr_sorted[0]
  count = 0
  wArr_sorted.each do |e|
    if(_e != e)
        if(count%2==1)
          puts "No"
          return 0
        end
        count = 0
    end
    count = count+1
    _e = e
  end

  puts "Yes"
  return 0
end

main()