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()
fy = int(year)
t = True
c = 0

while t:
    fy += 1
    year_list = []
    for i in str(fy):
        year_list.append(i)

    for x in year_list:
        if year_list.count(x) == 1:
                c += 1
        if c == len(year_list):
            t = False
            break
    c = 0

print(fy)