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())
for i in range(n+1, 90000):
    s = list(str(i))
    temp = 0
    for j in s:
        if s.count(j) == 1:
            temp += 1
            continue
        else:
            break
    if temp == len(str(i)):
        print(i)
        break