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())
while(1):
    n=n+1
    s=str(n)
    f=0
    for i in s:
        if(s.count(i)==1):
            f=1
        else:
            f=0
    if(f==1):
        break
print(n)