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())
it = year + 1
bolean = True
while bolean == True:
    if len(str(year)) == len(set(str(it))):
        print(str(it))
        bolean = False
    it = it + 1