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_year(year):
    digits=set()
    while year>0:
        digit=year%10
        if digit in digits:
            return False
        digits.add(digit)
        year //=10
    return True
def beautiful():
    year=int(input())
    year+=1
    while not distict_year(year):
        year+=1
    print(year)
beautiful()    