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.
uniq = []
a = input()
b = int(a)
b += 1
year = str(b)
while len(uniq) != 4:
  uniq = []
  nums = list(year)
  for x in nums:
    if x not in uniq:
      uniq.append(x)
  if len(uniq) == 4:
    print(year)
    break
  else:
    print(len(uniq))
    intyear = int(year)
    intyear += 1
    year = str(intyear)
