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 Python (3.4.3) (judge verdict: Accepted)

W = input()
words = {}
odd = False

for w in W:
    if w in words:
        words[w] = words[w] + 1
    else:
        words[w] = 1

for word in words:
    if words[word] % 2 == 1:
        odd = True
        
if odd:
    print('No')
else:
    print('Yes')