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.
year = input()
new_year = int(year)

while True:
  new_year += 1
  ls = sorted(list(str(new_year)))

  valid = True
  for i in range(len(ls) - 1):
    if ls[i] == ls[i + 1]:
      valid = False
      continue

  if valid:
    print(new_year)
    break