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 uniqueYear(st: str):
      st = sorted(st)
      for i in range(len(st)-1):
            if st[i] == st[i+1]:
                  return False
      return True

year = str(int(input())+1)

while not uniqueYear(year):
      year = str(int(year)+1)
      
print(year)