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.
y = int(input())
while(1):
  y1 = y+1
  y1 = str(y1)
  y2 = set(y1)
  if len(y1) == len(y2):
    break
  else:
    y += 1 
print(y1)