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())

while len(str(n))!=len(set(str(n))):
  n+=1
  if len(str(n))==len(set(str(n))):
    print(n)
    break

if n==n+1:
  print(n)
else:
  pass