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.
year = int(input())
year += 1
while True:
    p = str(year)
    if p[0] not in [p[1], p[2], p[3]] and p[1] not in [p[0], p[2], p[3]] and p[2] not in [p[0], p[1], p[3]] and p[3] not in [p[0], p[2], p[1]]:
        print(year)
        break
    else:
        year += 1