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.
n = int(input())
def judge(n):
    n = str(n)
    for i in range(len(n)):
        for j in range(i + 1,len(n),1):
            if n[i] == n[j]:
                return False
    return True
while True:
    n += 1
    if judge(n):
        print(n)
        break