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.
y=int(input())
for i in range(y+1,y+1001):
    k=str(i)

    if(k[0]!=k[1] and k[0]!=k[2] and k[0]!=k[3] and k[1]!=k[2] and k[1]!=k[3] and k[2]!=k[3]):
        print(i)
        break