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())+1
while(True):
  s=str(n)
  x=sorted(list(s))
  y=sorted(list(set(x)))
  if(x==y):
    break
  else:
      n=n+1
print(n)