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.
year = str(int(input()) + 1)
def check(year):
    newyear = set(year)
    if len(year) == len(newyear):
        print(year)
    else:
        workon(year)

def workon(year):
    year = str(int(year) + 1)
    check(year)

check(year)