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.
year1 = input()
year2_number = int(year1) + 1
year_list = []
checker = 0

while checker == 0:
  for number in str(year2_number):
    if number not in year_list:
      year_list.append(number)
    else:
      year_list.clear()
      year2_number += 1
  
  if len(year_list) == 4:
    checker = 1

print(year2_number)