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.
old_num = int(input())
new_num = old_num + 1
while True:
    judge_list = []
    for element in str(new_num):
        if element not in judge_list:
            judge_list.append(element)
    if len(judge_list) == len(str(new_num)):
        break
    else:
        new_num += 1
print(new_num)