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()) + 1

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

print(n)