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 setn (num):
    s = set(num)
    if len(num) > len(s):
        return False
    else:
        return True 

year = int(input())

while True :
    year += 1
    s = setn(str(year))
    if s :
        print(year)
        break 



