def main():
  from sys import stdin
  readline = stdin.readline
  s = readline()[:-1]
  n = len(s)
  t = 'kadomatsu'
  if n > len(t):
    print('No')
    exit()
  arr_t = [x for x in t]
  delta = []
  for i in range(n):
    if s[i] in arr_t:
      delta.append(arr_t.index(s[i]))
      if arr_t.index(s[i]) >= 1 and s[i] != 'a' and 'a' in arr_t:
        arr_t.remove('a')
      arr_t.remove(s[i])
    else:
      print('No')
      exit()
  flag = (delta == list(sorted(delta)))
  print('Yes' if flag else 'No')


  
if __name__ == "__main__":
  import sys
  readline = sys.stdin.readline
  def error(*args, end='\n'):
    print(*args, end=end, file=sys.stderr)
  main()