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=int(input())
result=year
while result>=year:
       result+=1
       letters=[]
       for i in str(result):
              letters.append(i)
              num_letters=set(letters)
       if len(num_letters)==4:
              print(result)
              break
