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 = input()
n = str(int(n)+1)
A = True
count = 0
while A:
    for i in range(len(n)):
        for j in range(len(n)):
            if n[i] == n[j] and i != j:
                count += 1
            else:
                pass
    if count == 0:
        A = False
        print(n)
    else:
        n = str(int(n)+1)