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: Wrong Answer)

w = input()

for i in range(len(w)):
    count = 0
    for j in range(len(w)):
        if w[i] == w[j]:
            count = count + 1
    if count%2 == 1:
        print('No')
        break
        
if i+1 == len(w):
    print('Yes')