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())

n=(n+1)
c=0
v=0
while(c==0):
    s=str(n)
    l=list(s)
    for i in l:
        k=l.count(i)
        if(k==1):
            v+=1
    if(v==len(s)):
        print(int(s))
        c=1
        break
    n+=1
    v=0
        