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.
def judge(s):
    l = []
    for a in s:
        if a in l:
            return False
        else:
            l.append(a)
    return True


s = input()
n = int(s)
while True:
    n += 1
    if judge(str(n)):
        print(n)
        break
