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 e(y):
  digits = set()
  for digit in str(y):
    if digit in digits:
      return False
    digits.add(digit)
  return True
n = int(input())
t = n + 1
while not e(t):
  t += 1
print(t)