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.
p=int(input())
for i in range(p+1,10000):
    a=str(i)
    if a[0]!=a[1] and a[1]!=a[2] and a[2]!=a[3] and a[0]!=a[2]and a[0]!=a[3]and a[1]!=a[3]:
        print(i)
        break