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())
for i in range(year+1,9000):
    qian=i//1000
    bai=(i-qian*1000)//100
    shi=(i-qian*1000-bai*100)//10
    ge=(i-qian*1000-bai*100-shi*10)
    if qian!=bai and qian!=shi and qian!=ge and bai!=shi and bai!=ge and ge!=shi:
        print(i)
        break