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.
s = int(input())
running = True
while running:
    s += 1
    st = str(s)
    for each in st:
        if st.count(each) == 1:
            if st[-1] == each:
                print(st)
                running = False
                break
            else:
                continue
        else:
            break
    continue
