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())
n=y+1
while (str(n)[3] == str(n)[2] or str(n)[3] == str(n)[1] or str(n)[3] == str(n)[0] or str(n)[2]==str(n)[1] or str(n)[2]==str(n)[0] or str(n)[1]==str(n)[0]):
  n+=1
print(n)