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 making_list_from_int(integer):
    ans = []
    string = str(integer)
    for item in string:
        ans.append(item)
    return ans


def checking_double_items(kit):
    ans = False
    for item in kit:
        if kit.count(item) >= 2:
            ans = True
    return ans


year = int(input()) + 1
while checking_double_items(making_list_from_int(year)):
    year += 1
print(year)
