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.
def count(text,num):
    test = 0
    dic={}
    for let in text:
        if let not in dic:
          dic[let]=0
        dic[let]+=1
    for key in dic.keys():
        if dic[key]==1:
            test +=1
    if test ==4:
        print(text)
    else:
      (num)=int(num)+1
      text=str(num)
      count(text,num)



num=int(input())+1
st1=str(num)
count(st1,num)