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.
n=int(input())
i=n+1
while(i>n):
    l = []
    f=0
    p=str(i)
    for j in range(4):
        l.append(p[j])
    for e in l:
        if l.count(e)>1:
            f=1
            continue
    if f==0:
        print(int(p))
        break
    i+=1

