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)

import sys
def input(): return sys.stdin.readline().strip()

def resolve():
    w=list(input())
    w.sort()
    if len(w)%2!=0:
        print('No')
    else:
        for i in range(0,len(w)-2,2):
            if w[i]!=w[i+1]:
                print('No')
                break
        print('Yes')
resolve()