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.
x=input()

if x[0]!=x[1]!=x[2] and x[1]!=x[2] and x[2]!=x[3] and x[3]!=x[0] and x[1]!=x[3]:
  print(x)
else:
  while True:
    x=int(x)+1
    x=str(x)
    if x[0]!=x[1]!=x[2] and x[1]!=x[2] and x[2]!=x[3] and x[3]!=x[0] and x[1]!=x[3]:
      print(x)
      break
