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 = input()
x = int(n)
for i in range(x + 1, 9000):
    i = str(i)
    if i[0] != i[1] and i[0] != i[2] and i[0] != i[3] \
            and i[1] != i[2] and i[1] != i[3] and i[2] != i[3]:
        x = i
        break
print(int(x))
