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 has_distinct_digits(year):
    digits = set()
    for digit in str(year):
        if digit in digits:
            return False
        digits.add(digit)
    return True

def distinct_year(year):
    next_year = year + 1
    while not has_distinct_digits(next_year):
        next_year += 1
    return next_year


given_year = int(input(" "))
next_distinct_year = distinct_year(given_year)
print(next_distinct_year)
