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.
y = int(input())
next_year = y + 1
while True:
                 digits = set()
                 for digit in str(next_year):
                                  if digit in digits:
                                                   break
                                  digits.add(digit)
                 else:
                                  print(next_year)
                                  break
                 next_year += 1