ary = gets.chomp.chars.map(&:to_s)

t = nil
hash = {}
ary.each do |v|
  if hash[v]
    hash[v] += 1
  else
    hash[v] = 1
  end
end
hash.each do |k2, v2|
  if v2 % 2 == 0
    t = "Yes"
  else
    t = "No"
    break
  end
end
puts t