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]
  delta1 = []
  delta2 = []
  for i in range(n):
    if s[i] in arr_t:
      delta1.append(arr_t.index(s[i]))
      delta2.append(arr_t.index(s[i]))
      arr_t.remove(s[i])
      if s[i] in arr_t:
        delta2 = delta2[:-1]
        delta2.append(arr_t.index(s[i]))
    else:
      print('No')
      exit()
  error(delta1, delta2)
  flag = (delta1 == list(sorted(delta1)) or delta2 == list(sorted(delta2)))
  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()