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 is_distinct(s):
    for d in set(s):
        if s.count(d) >= 2:
            return False
    return True

while True:
    n += 1
    n_str = str(n)
    if is_distinct(n_str):
        print(n_str)
        break
