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()

res = str(int(year)+1)
beautiful = False

while not beautiful:
    s = set()
    beautiful = True
    for c in res:
        if c in s:
            res = str(int(res)+1)
            beautiful = False
        else:
            s.add(c)

print(res)