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 Common Lisp (SBCL 1.1.14) (judge verdict: Accepted)

(setq s(sort(concatenate'list(read-line))#'char<))
(princ(if(=(mod(length s)2)1)"No"(if(>(loop for i from 0 to(1-(/(length s)2))count(char/=(nth(* i 2)s)(nth(1+(* i 2))s)))0)"No""Yes")))