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.
ref = 0


def distinct(year):
    year = str(year)
    for i in range(len(year)):
        for j in range(i+1, len(year)):
            if (year[i] == year[j]):
                return False
    return True


def call(year):
    global ref
    if (distinct(year) and year > ref):
        return year
    else:
        year = year+1
        return call(year)


year = int(input())
ref = year
print(call(year))
