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 = str(int(input()) + 1)
while True:
    d = []
    x = True
    for i in range(len(n)):
        if n[i] in d:
            x = False
        else:
            d.append(n[i])
    if x:
        print(n)
        break
    else:
        n = str(int(n) + 1)