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()) + 1
count = 0
arr = []
while True:
    for i in range(len(str(year))):
        if str(year)[i] not in arr:
            arr.append(str(year)[i])
    if len(arr) == 4:
        print("".join(arr))
        break
    year += 1
    arr.clear()