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.
entrada = int(input())
for i in range(entrada + 1, 9001):
    if str(i).count(str(i)[0]) == 1 and str(i).count(str(i)[1]) == 1 and str(i).count(str(i)[2]) == 1\
            and str(i).count(str(i)[3]) == 1:
        print(i)
        break