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 = int(input())
i = n + 1
def fun(x):
    a = x % 10
    b = x // 10 % 10
    c = x // 100 % 10
    d = x // 1000
    s = {a, b, c, d}
    if len(s) == 4:
        return 1
    return -1
while 1:
    if i > n and fun(i) == 1:
        print(i)
        break
    i += 1