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 Lua (5.3.2) (judge verdict: Accepted)

--string.char(97)はa
local t = {}
local str = io.read("*l")
for i = 97, 122 do
  t[i] = 0
end
for i = 1, #str do
  local num = string.byte(string.sub(str, i, i))
  t[num] = t[num] + 1
end
for i = 97, 122 do
  if t[i] % 2 == 1 then
    print("No")
    os.exit()
  end
end
print("Yes")