It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.
def next_year(y):
  """Returns the minimum year number which is strictly larger than the given one and has only distinct digits.

  Args:
    y: The year number.

  Returns:
    The minimum year number which is strictly larger than y and all it's digits are distinct.
  """

  while True:
    y += 1
    if len(set(str(y))) == 4:
      return y

if __name__ == "__main__":
  y = int(input())

  next_year = next_year(y)
  print(next_year)
	   	 			  	 	    	  				  	