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 = [int(a) for a in str(n)]
    A = set()
    A.add(x[0])
    A.add(x[1])
    A.add(x[2])
    A.add(x[3])
    if len(A) == 4:
        break
print(n)