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.
no = int(input())
not_answer = True
while not_answer:
    no += 1
    new = set()
    for digit in str(no):
        new.add(digit)
    if len(new) == 4:
        not_answer = False

print(no)