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.
n = int(input())

if 1000 <= n <= 9000:
    t = str(n)
    unique_digits = set(t)  # Initialize a set with the digits of n
    while True:
        n += 1
        t = str(n)
        # Check if all digits in t are unique
        if len(set(t)) == len(t):
            print(t)
            break
