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())

a = [year for year in range(y+1, 9001) if len(set(str(year))) == 4]

numero_cercano = min(a, key = lambda x : abs(x - y))

print(numero_cercano)
    



