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.
data = input()
year = int(data)

while True:
    num = year + 1
    unique = set()
    new_year = num

    while num != 0:
        unique.add(num % 10)
        num = num // 10
    
    if len(unique) == len(data):
        print(new_year)
        break

    year += 1