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 distinct(n):
    s = str(n)
    ls =[]
    for i in s:
        ls = ls + list(i)
    l1 = len(ls)
    l2 = len(set(ls))
    if l1 ==l2:
        return True
    else:
        return False

year = int(input())
while(distinct(year+1)==False):
    year = year +1
print(year+1)