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.
input_year = int( input() )

year = input_year + 1
searching = True

while searching:

    searching = False
    str_year = str(year)

    for digit in str_year:
        if str_year.count(digit) > 1:
            searching = True
            break

    if not searching: 
        break

    year += 1


print(year)