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.
t = int(input())
t = t + 1
m = True
while m:
    s = str(t)
    a = list(s)
    d = dict.fromkeys(a)
    if len(d) == 4:
        m = False
        print(t)
    else:
        t = t+1
