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.
result = ""
year = int(input())
if 1000 <= year and year <= 9000:
    while True:
        year += 1
        s = set()
        for y in str(year):
            s.add(y)
        if len(s) == len(str(year)):
            break
result = year
print(f"{result}")