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.
def norepeat(n):
      if len(set(str(n))==len(str(n)):
           return false
      return false


n=int(input())
while true:
       n+=1
       if norepeat(n):
            print(n)
            break
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