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.
k=int(input())
for t in range(k+1,90000):
    p=list(str(t))
    u=0
    for x in p:
        if p.count(x)==1:
            u+=1
            continue
        else:
            break
    if u==len(str(t)):
        print(t)
        break