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.
n=(input())
k=int(n)
while(True):
   temp=k+1
   year_str=str(temp)
   if(len(set(year_str)) == len(year_str)):
      print(temp)
      break
   else:
      k=k+1
      

      
