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=list(input())
w.sort()
b=w[0]
y=1
Y=0
for i in range(len(w)-1):
    if b==w[i+1]:
        y+=1
    else:
        if y%2!=0:
            Y+=1
            y=1
            b=w[i+1]
if Y==0 and y%2==0:
    print('Yes')
else:
    print('No')