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())
def distinct(n):
    digits=set()
    for i in str(n):
        if i in digits:
            return False
        digits.add(i)
    return True
def next(n):
    n +=1
    while not distinct(n):
        n+=1
    return n
print(next(n))
