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 b_year():
    year = input()
    base = set(year)
    new_set = set()
    new_collec = []
    while(len(base) != len(new_set)):
        # go to next year
        year = int(year) + 1
        
        # prepare to make a set
        new_collec = list(str(year))
        new_set = set(new_collec)
    return ''.join(new_collec)

print(b_year())