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.
Num = int(input())
for p in range(Num+1, 90000):
    l = list(str(p))
    C = 0
    for q in l:
        if l.count(q) == 1:
            C += 1
            continue
        else:
            break
    if C == len(str(p)):
        print(p)
        break