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 byear(y):
    l = []
    l.extend(str(y))
    s = set(l)
    if len(l)==len(s):
        return True
    else:
        return False

year = int(input())
year = year+1
while True:
    if byear(year)==True:
        print(year)
        break
    else:
        year+=1
