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+=1
s=str(n)

c=0
for i in range(n):
    if s[0]==s[1] or s[0]==s[-1] or s[0]==s[-2] or s[1]==s[-1]or s[1]==s[-2] or s[-1]==s[-2]:
        c+=1
        n+=1
        s=str(n)
print(s)
    