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.
year = int(input())
while True:
    year += 1
    check = True
    for i in range(10):
        if str(year).count(str(i)) > 1:
            check = False
            break
    if check:
        break
print(year)