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.
x = int(input(""))

while True:
    x = x + 1

    l = [int(i) for i in str(x)]
    dup = []

    for t in l:
        if t in dup:
            pass
        else:
            dup.append(t)


    if dup == l:
        print(x)
        break

