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.
a = input()
while int(a) < 9000:
  a = str(int(a) + 1)
  d = {}
  flag = True
  for i in range(4):
    if(a[i] in d):
      flag = False
      break
    d[a[i]] = 1
  if(flag == True):
    break
print(a)