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 is_distinct_year(year):
    year_str = str(year)
    return len(year_str) == len(set(year_str))

def find_next_distinct_year(y):
    while True:
        y += 1
        if is_distinct_year(y):
            return y

y = int(input())
next_distinct_year = find_next_distinct_year(y)
print(next_distinct_year)
