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 get_next_year(year) :
    for next_year in range(year + 1,9001) :
        s = str(next_year)
        unique = set()
        for char in s :
            if char not in unique :
                unique.add(char)
            else :
                break
        if len(unique) == 4 :
            return next_year
    return 9012

year = int(input())
print(get_next_year(year))