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_number = input()
stop = True
result = int(year_number)

while stop:
   result = result + 1
   setOfNumbers = set(str(result))
   if len(setOfNumbers) == len(year_number):
      stop = False
   result = int(result)

print(result)
    
