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 Ruby (2.3.3) (judge verdict: Accepted)

#coding: utf-8

a=gets.chomp
i=0
f=0
co=Array.new(26,0)
while(i<a.length)
	co[a[i].ord-"a".ord]+=1
	i+=1
end
i=0
while(i<26)
	unless(co[i]%2==0)
		f+=1
	end
	i+=1
end
unless(f==0)
	puts("No")
else
	puts("Yes")
end