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()
beautiful_year = int(year) + 1

while True:
  check = set(str(beautiful_year))
  if len(check) == len(str(beautiful_year)):
    break
  else: beautiful_year += 1

print(beautiful_year)  