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())
for i in range(n + 1, 9000):
  x = [j fro j in str(i)]
  sz = len(x)
  x = set(x)
  if len(x) == sz:
    print(i)
    break