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())+1
i=0
while y>=1000:
  while i<3:
    for j in range(i+1,4):
      if str(y)[i]==str(y)[j]:
        y+=1
        i=0
        break
    else:
      i+=1
  else:
    break

print(y)
