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())

while True:
    y += 1
    s = str(y)
    flag = True

    for i in range(len(s)):
        for j in range(i+1, len(s)):
            if s[i] == s[j]:
                flag = False
                break
        if not flag:
            break
    if flag: 
        print(y)
        break