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())
if y<2013:
    print("2013")
else:
    while True:
        y=y+1
        rl=list(map(int, str(y)))
        rs=set(map(int, str(y)))
        if len(rl)==len(rs):
            print(y)
            break
        else:
            y=y+1