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 digits(year):
    year_str = str(year)
    return len(set(year_str)) == len(year_str)

def d_digits(y):
    next_year = y + 1
    while not digits(next_year):
        next_year += 1
    return next_year

y = int(input())

print(d_digits(y))