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())
for i in range(a+1,9002):
    c=str(i)
    if(c[0]!=c[1] and c[1]!=c[2] and c[2]!=c[3] and c[1]!=c[3] and c[0]!=c[2] and c[0]!=c[3] ):
        print(c)
        break
    