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.
#271A
c = int(input())
l = 0
while l != 4:
    c += 1
    n = str(c)
    m = n.split
    k = list(set(n))
    l = len(k)
print(n)