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.
y = int(input())

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

year = y + 1
while not has_unique_digits(year):
    year += 1

print(year)
