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 beautiful_year(s):
    for i in range(0, len(s)):
        if n[i] in n[i+1:]:
            return False
    else:
        return True
            

n=str(input())
n=str(int(n)+1)

ans=None
while ans==False:
    ans=beautiful_year(n)
    n=str(int(n)+1)
print(n)
