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())

for i in range(8000):
    n += 1
    y = n
    a = y % 10
    y = y // 10
    b = y % 10
    y = y // 10
    c = y % 10
    y = y // 10
    d = y

    if a != b and a != c and a != d and b != c and b != d and c != d:
        print(f"{d}{c}{b}{a}")
        break
