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())
k = 1
l = str(n)
while k == 1:
    k = 0
    l = str(int(l) + 1)
    for i in range(len(l) - 1):
        for j in range(i + 1, len(l)):
            if l[j] == l[i]:
                k = 1
print(int(l))
