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.
n = input() # unique year

# find unique year such that u > n

i = str(int(n) + 1)

while True:

    ci = [c for c in i]

    if len(set(ci)) == len(ci):

        print(i)

        break

    else:

        i = str(int(i) + 1)