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.
# Beautiful Year
def is_beautiful(year):
    for i in year:
        if year.count(i) != 1:
            return False
    return True


def find_beautiful_year(year):
    year_int = int(year)
    year_int += 1
    while not is_beautiful(str(year_int)):
        year_int += 1
    return year_int


print(find_beautiful_year(input()))