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()
ws = sorted(w)
if len(w)%2!=0:
    print("No")
else:
    for i in range(len(w)):
        if i%2 != 0:
            if ws[i] != ws[i-1]:
                print("No")
                break
    print("Yes")