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())
while True:
    n += 1
    x = n
    a = [0] * 4
    i = 3
    while x > 0:
        a[i] = x % 10
        x = x // 10
        i -= 1
    if (
        a[0] != a[1]
        and a[0] != a[2]
        and a[0] != a[3]
        and a[1] != a[2]
        and a[1] != a[3]
        and a[2] != a[3]
    ):
        break

print(n)