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.
y = int(input())
yy = y + 1
count = []
value = 0
while value == 0:
    for num in str(yy):
        if num not in count:
            count.append(num)
            if len(count) == len(str(yy)):
                print(yy)
                value = 1
        elif num in count:
            yy = yy + 1
            count = []
            break
