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.
s = str(int(input()))
ss=set()
count=0
while count == 0:
    for i in s:
        ss.add(i)
    if len(ss) == len(s):
        s=int(s)
        count = s
    s =int(s)
    s+=1
    s=str(s)
print(count)        