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.
def different(n):
    n += 1
    listn = [str(n)[i] for i in range(len(str(n)))]
    while True:
        if len(listn) != len(set(listn)):
            n += 1
            listn = [str(n)[i] for i in range(len(str(n)))]
        else:
            break
    return n


n = int(input())
print(different(n))