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 = input()
year = int(year) + 1
i = False
while i == False:
    year = str(year)
    distinct = set(year)
    year = int(year)


    if len(distinct) == 4:
        break
    else:
        year += 1



print(year)