output_description: Print `Yes` if w is beautiful. Print `No` otherwise.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      w
attempt: d = {c: list(input()) for c in "abc"}
  s = "a"
  while d[s]:
      s = d[s].pop(0)
  print(s.upper())
  
problem_description: 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.
samples: [{"input": "abaccaba", "output": "Yes\n    \n\n`a` occurs four times, `b` occurs twice, `c` occurs twice and the other\nletters occur zero times.\n\n* * *"}, {"input": "hthth", "output": "No"}]