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.
# your code goes here
def main():
    year = int(input())

    while True:
        year += 1
        a = year // 1000
        b = (year // 100) % 10
        c = (year // 10) % 10
        d = year % 10

        if a != b and a != c and a != d and b != c and b != d and c != d:
            break

    print(year)

if __name__ == "__main__":
    main()
