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.
x = int(input())
x += 1
y = False
for i in range(x, 10000):
  a = str(i)
  num = list()
  for j in range(4):
    if a[j] not in num:
      num.append(a[j])
  if len(num) == 4:
    print(i)
    break