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.
s = input()
x = int(s) + 1
s = str(x)
n = len(s)
while True:
    i = 0
    digits = {'-8'}
    while i < n and not (s[i] in digits):
        digits.add(s[i])
        i += 1
    if i == n:
        break
    x += int(pow(10, n - i - 1))
    s = str(x)
print(x)
