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

y = int(input())  # Given year

while True:
    y += 1
    if has_distinct_digits(y):
        print(y)
        break
