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 PyPy3 (2.4.0) (judge verdict: Runtime Error)

import sys
s = input()
ans = ['a':0,'b':0,'c':0]
for i in s:
	if i in ans:
		ans[i] +=1
    else:
		print('NO')
        sys.exit()
print('YES' if (ans['a']%2==0 and ans['a']%2==0 and ans['a']%2==0) else 'NO')