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.
def isDistinct(s):
    cnt = 0
    for i in range(len(s)):
        for j in range(i+1,len(s)):
            if (s[i] == s[j]):
                cnt += 1
    return cnt

n = int(input())
while(n <= 9000):
    n += 1
    if (isDistinct(str(n)) == 0):
        print(n)
        break