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.
def distinct_digits_year(year):
    year += 1
    while len(set(str(year))) != len(str(year)):
        year += 1
    return year

given_year = int(input())
result = distinct_digits_year(given_year)
print(result)