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())
for i in range(n+1,9001):
    temp=str(i)
    dic={}
    for i in range(len(temp)):
        if temp[i] not in dic:
            dic[temp[i]]=1
        else:
            dic[temp[i]]=dic[temp[i]]+1

    if len(dic)==len(str(n)):
        print(int(temp))
        break
    

