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
year_list = []
for i in year:
    year_list.append(i)

while t:
    fy += 1
    for x in year_list:
        if year_list.count(x) != 1:
            break
        else:
            t = False
            break

print(fy)