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.
while True:
    jaar = input()
    if 1000 <= int(jaar) <= 9000:
        break
cijfers="1234567890"
ctrl = False
for x in range(int(jaar)+1,9001,1):
    for y in cijfers:
        z=str(x).count(y)
        if z == 1 or z == 0:
            ctrl = True
        else:
            ctrl = False
            break
    if ctrl == True:
        print(x)
        break