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.
const = int(input())         ##year
const+= 1
const = str(const)

lenght = len(const)         ##length of year
##set1 = set(const)

while True:
    set1 = set(const)
    if len(set1) == lenght:

        print(const)
        break
    else:
        set1.clear()
        const+=1

