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.
def fun(n):
    n+=1
    l=[int(i) for i in str(n)]
    for i in l:
        if l.count(i)>=2:
            return fun(n)
    return n

n=int(input())
print(fun(n))
