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.
a=int(input())
b=str(a)
i=0
for i in range(b+1,9999):
    if (b[0] != b[1] and b[0] != b[2] and b[0] != b[3] and b[1] != b[2]and b[1] != b[3]and b[2] != b[3]):
        print(b)
        break